Well that depends how you play - my Rad/Thermal is built for team play and up until her respec less than an hour ago, she couldn't solo. She's lvl 27 atm.
Warmth/Causterize - priority would be 1st slot Heal, 2nd Recharge and so on. Mine have 3 heal, 2 recharge
Fire Shield/Plasma Shield - res of course and end reduction if you feel you need it (such as those who like to buff an MMs pets 
). Mine have 2 res in them at the mo.
Rise of The Phoenix - 1 recharge should suffice.
Thaw - Whatever you want. I went with a res.
As for general attack slotting advice, I'd say start with an accuracy, then 2 damage and add damage, recharge and endurance reduction to taste. The jack-of-all-trades slotting is 1 acc, 3 dam, 1 rchg, 1 end rdx. I tend to slot them in that order off importance, too. Some powers get an extra recharge instead of the endurance reduction, some an extra endurance reduction instead of the 3rd damage. It's all down to taste.
@Jay Leon Hart
Kerensky: this has nothing to do with underwear
Zwillinger: I put on my robe and wizard hat...
Synapse: I had to resist starting my last post off with "Yo dawg!"
like leonhart said it depends how u wanna play. since i9 i picked up stealth and a stealth travel IO and am loving being an illu/corruptor. makes life a lot easier when u cant be seen
heres my current build and its no where near perfect as i havent been playing it long, still experimenting. also its a pvp build but it has no end troubles at all, pre i9 it was a nightmare for end. hope it helps 
Villain Plan by Mids' Villain Designer 1.153
http://www.onthejazz.co.uk/hu/mhd.php
Panthera-Hybrid: Level 50 Mutation Corruptor
Primary Power Set: Fire Blast
Secondary Power Set: Thermal Radiation
Power Pool: Fitness
Power Pool: Speed
Power Pool: Leaping
Power Pool: Concealment
Ancillary Pool: Mu Mastery
Villain Profile:
Level 1: Fire Blast -- Thundr-Acc/Dmg:50(A), Thundr-Dmg/EndRdx:50(3), Decim-Acc/Dmg:40(3), Decim-Dmg/EndRdx:40(5), Decim-Dmg/Rchg:40(5), Decim-Acc/EndRdx/Rchg:40(7)
Level 1: Warmth -- Dct'dW-Heal/EndRdx:50(A), Dct'dW-EndRdx/Rchg:50(7), Dct'dW-Heal/Rchg:50(9), Dct'dW-Heal:50(9), Dct'dW-Rchg:50(11), Dct'dW-Heal/EndRdx/Rchg:50(11)
Level 2: Fire Shield -- ImpArm-ResDam:40(A), ImpArm-ResDam/EndRdx:40(17), ImpArm-ResDam/Rchg:40(19), ImpArm-ResDam/EndRdx/Rchg:40(19), S'fstPrt-ResKB:30(21)
Level 4: Cauterize -- Mrcl-Heal/EndRdx:40(A), Mrcl-EndRdx/Rchg:40(13), Mrcl-Heal/Rchg:40(13), Mrcl-Heal:40(15), Mrcl-Heal/EndRdx/Rchg:40(15), HO:Golgi(17)
Level 6: Swift -- Run-I:50(A), Run-I:50(50)
Level 8: Hasten -- RechRdx-I:50(A), RechRdx-I:50(29), RechRdx-I:50(29)
Level 10: Plasma Shield -- ImpArm-ResDam/EndRdx:40(A), ImpArm-ResDam/Rchg:40(25), ImpArm-ResDam:40(27), ImpArm-ResDam/EndRdx/Rchg:40(27)
Level 12: Combat Jumping -- SprngFt-Jump:50(A), SprngFt-EndRdx:50(31), SprngFt-EndRdx/Jump:50(33), ULeap-Stlth:50(33)
Level 14: Super Speed -- QckFt-RunSpd:50(A), QckFt-EndRdx:50(31), QckFt-EndRdx/RunSpd:50(31)
Level 16: Health -- Mrcl-Heal/EndRdx:40(A), Mrcl-EndRdx/Rchg:40(34), Mrcl-Heal:40(36), Mrcl-Rcvry+:40(36), Numna-Regen/Rcvry+:40(36)
Level 18: Power of the Phoenix -- Dct'dW-Heal/EndRdx:40(A), Dct'dW-EndRdx/Rchg:40(21), Dct'dW-Heal/Rchg:40(23), Dct'dW-Heal/EndRdx/Rchg:40(23), Dct'dW-Heal:40(25)
Level 20: Stamina -- EndMod-I:50(A), EndMod-I:50(34), EndMod-I:50(34)
Level 22: Thaw -- Range-I:50(A)
Level 24: Blaze -- Thundr-Acc/Dmg:40(A), Thundr-Dmg/EndRdx:40(37), Decim-Acc/Dmg:40(39), Decim-Dmg/EndRdx:40(39), Decim-Dmg/Rchg:40(39), Decim-Acc/EndRdx/Rchg:40(40)
Level 26: Super Jump -- SprngFt-Jump:50(A), SprngFt-EndRdx:50(33), SprngFt-EndRdx/Jump:50(50)
Level 28: Forge -- HO:Membr(A), HO:Membr(37), HO:Membr(37)
Level 30: Stealth -- GftotA-Run+:40(A), GftotA-Def/EndRdx:40(40), GftotA-Def/EndRdx/Rchg:40(40), GftotA-EndRdx/Rchg:40(42), Krma-ResKB:30(42)
Level 32: Grant Invisibility -- GftotA-Def/Rchg:40(A), GftotA-EndRdx/Rchg:40(42)
Level 35: Invisibility -- GftotA-Run+:40(A), GftotA-Def/EndRdx:40(48), GftotA-EndRdx/Rchg:40(48), GftotA-Def/EndRdx/Rchg:40(50)
Level 38: Melt Armor -- HO:Lyso(A), HO:Lyso(46), HO:Lyso(46), RechRdx-I:50(46), RechRdx-I:50(48)
Level 41: Heat Exhaustion -- RechRdx-I:50(A), RechRdx-I:50(43), Acc-I:50(43), Acc-I:50(43)
Level 44: Charged Armor -- ImpArm-ResDam/EndRdx:40(A), ImpArm-ResDam:40(45), ImpArm-EndRdx/Rchg:40(45), ImpArm-ResDam/EndRdx/Rchg:40(45)
Level 47: Phase Shift -- RechRdx-I:50(A)
Level 49: Aim -- HO:Membr(A)
------------
Level 1: Brawl -- Empty(A)
Level 1: Sprint -- Empty(A)
Level 1: Scourge
Level 2: Rest -- Empty(A)
Copy & Paste this data chunk into Mids' Hero Designer to view the build.
--------------------------------------------------------------------------
MHDz;5948;1740;2320
>-J=6$MS&S<,OGO&_T&W'C*I^>:N>$K BYM'$G=1.V_-&6MN:6"O/2LK4_[X``9+22K*ECBWI6Q``"1``
P?W8]HO+9M7\W?;+V
+\E=U?O:UZ5;W;=^\_OCTO9]-P]5ZU:QP]-VB[]>/JT4?K#@_>S_KV]';AV:Y
"M^`?=X\C*Z;Z8Q8/W5`:KM5>#];=>UR&6X>VW8:OK3-XZR[`TW=I&T>YLAQM1Y=@9*V?SH_>RW#X%\$
F,K"=ZB#U$''V0=5`R*!V4#<H'50<M@]9!VZ!]T'4P,A@=C`W&!U,'*X/5P=I@?;!U<#(X'9P-S@=7
!Z^"-\'[4(E0J5#94%6AA@EUJ%VHJR"%A(^!CX,/K$,J^,`S+@76`BN4*BXU_M&JZ4<2@'^92"J35"+I
3-*)9!*P21+F(XH+R3DV(Y>4^0@$_+*J"@#QU$FI)/5@+6@@"NKB=2I01D0=$7K>,P7<E-C`2TQT$0E4
6S/)`V(^=!]3:X("IY-LE8I/[(\X.Y$508$_DDV!#9?)&&5P-42V!`4'"!$=0N;UN$@B5P0%BD@V"^)'
)KNTP"5'LI8$18PZ-DTKA,RK<?E$-@0%JE=L&X2C2K9IAS81V1,4.*MBVW2%D'EK-(\V71",JU)LFXDV
$Z]1:"J1-4$1\X-M,P8A\UJTG\B.H,!E*[;-Q%1BW@I=0>0Z0TA$36:JZ!\B1L@1J=!#1-8%F@(MNHV@
*]`3%.@9S;;;"B'KK=&;D>Q$@
`A2XFJ`LT!`4Z5[-+7*P2G#<./4]D7V!58(W;0
E"I0$X^X8=@[4
$9/RV&O<2*;`FV!#K>.H"^P(BAP@PT[Q]<(22^4*,/NJ62!JL!8]@B:`BU!@1%BV#E5A*S7X^X3N2JP
)B@PA@Q[!"HC0"XI,3J(K`K4$9Z?*1(NI5%N%DA5:B(^J,V'M*TH(K,"+) FZ%$W)M0Z+I"[2/I9*P:6+
:BI7'9MJ:*P5)LM+5*#R$-0+KI`QES254`Y[&2P/Q=QUZ0%.EZP/*TX9J3,4F"DNKP["VV49C3(5/Q@T
UJ<''7R6@2USV:2X)[R<\[-ZPPG?[M?=%$[U53_[T8[?3"87E_.[L1E+Z^%;C-->(??E8@*'>CL=_;,`
H>7X(QS-%[]UT^OIO\"KM=R2P/6.X?DUD5.M&U+Y@!+AT_RQ[7_.UO/1FWZ^Z,?7[?*RF0.7JEWDU77@
,VR@@HODP!:PHRQ.VBHMCO,F7+:3V3QV(5MFRS27IF-2A*M9WTP>VJ&YRB9."@&]J7$PN=IF-4/6Z\D]
S:X3HZ4S&2R]7G=CD+=I_8XC>;!^FJUH,DF3X^08[MZV@-8J3>"I"<"IV\D]F@!#.HU6G%][@R$K&[#K
O>R1,]M5<\MQ*!**/U6=_2EIY\V._KP2E_0SJWTNC(L!)HM);GP$]*8]-*6WB\5J_/MZ_@@<5HK,IV))
D3E<!AI5"6+B5-N!E?E\YM/<9XGPYWHV^1$GAFBX>9S&J8MEAANY38515YUU&am p;2YX>X*Y3%UE=LN-W1'1
'_LDZ)?#^,/BX6XVUF/K4FX[;DQ/V5'/'>2Q]09EJ+RI0_.P@:K6`PG]_,J*8+&VYJX6T@.8KA93R(Z2
.XIRTX2;5=M,;^&^,OK:+U;M).8I*/_\%O55%#:*!;#'/#(_=<V]8O3M^+KI[EK,S[("10J/RU!=!/0I
B8%RFEOXEP^1U*C"+.:E2I!YQ>&XV=U/ZG/CKCZ;I;'QE>@J&P?-XG[]#"A7CI>!L97[?Q[CVE1I?.J
XHYC;X'E475@M.;;D`@?9K>KT>V!)?PT9MN,H-+\A+KPRM<BLM+T>EVM%%%<A)9F8_YQ*=V^"XVBDZU
S8X'RX;#-_3F9D"G.]N!%5^VM]F!KIR^BM2K7?47>5MST"=N'?[JOF-807CA.X3QS>IA=1]Y[39O=<3"
-5_I]F9Z&E7/C.ICC@.ZN\0L/'9'+2E7SQ3\Q%,.A>O)S_[I5<PT,>0RX8_U?-8UORQ'[Q;=S^:A74[:
;@)"[5W;7111DZM0O"_)&,4[`9[&U,$Q?UR[AO-XOM)#)GUY6BY0ET^Z*KX<O]S,,>=135IB/J)-B[<[
Z4]HQZ($OLTXG`WE6'1B**9>$BNYE!=)M\U85??6E'C75%CF]NH>ZBW-+,N9\+GIYTTYWDR5CC=BD8>L
/:Q:T9WY0(U,PQ!@X&P84FXXI/<,:7X-=%*+&6_,ZG`7LWUD).[=`V9X5IBAR.FG3+RKX]NNW=1(0^KP
D#[@6\?OQ0Y%BR=Q\]RP.C6^DY@Z-5`J?G.W[Z"-5U%\4_1_DJ:.+S[E[@4LCN!KMF..IO.S_P#[%`MS
Thanks for the tips and btw im a group PvE player
my fire/thermal corr is currently level 24 and i like to hear if anyone of you yhave any tips on powers slotting etc.
(wont be posting build right now its 3.30 in the night)