I'd switch Tough and Energy Protection slotting.
L. Rod needs as much rech as possible, with my slotting I gave you almost capped neg energy defense, and if you want fire/cold def capped (with my changes f/c gets 44%ish with hide supressed), just replace the multistrike dam/rech in L. Rod with the 6th eradication.
The 12% regen bonuses from the Serendipities I took out are compensated by the pair of Numinas I put in Energy Drain.
I also added 20%ish recharge with LoTGs in your toggles instead of Serendipities.
And seriously, Moonbeam SUCKS. It has a 7.33 sec cast time with 6 sec interrupt, you have any idea how long it takes? Stalker snipes are terrible, terrible powers. And Dark Blast can round your ST attack chain especially since you're Elec.
I personally skip Stamina on /EA and slot Energy Drain for endmod but I just did some fine tuning to your build, didn't change anything drastically. Hope it helps some 
Btw you could replace the LoTG defense for a common def IO in Hide since with my mods you're over the cap for 10% regen bonuses.
Code:
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Thanks for the advice. This is my first stalker after playing brutes for years and the play style is definitely different. I had no idea the snipes were that bad, so I will pick up dark blast as you suggested.
I'll look at the other slotting more closely. I picked some of those IO's to avoid having to spend a fortune on the market for expensive sets and the few rare sets I have I am farming merits for those. Our defense numbers are close though I have a little higher Psi defense, but thanks for looking. You have given me some good ideas with that build.
Glad to help
Well that's the general purpose, to give you ideas, not to say 'use mah build it r0xx0rs!'
I don't actually have a ELM/EA, only one planned that's quite different, but I have a 50 ELM brute and an EA Stalker. TBH I suggested you to cap your neg energy defense because I find it's more important than fire/cold (which I actually have at 35%ish).
And yeah, 7.33 seconds is an eternity, idk why they did this to Stalker snipes. Really everyone hates them
And well since you mentioned PvP... I'm no expert because last time I did it was i12, but you'd need Stealth (the pool power) + a Stealth IO in sprint, and SS+SJ as travel powers. If you wanna PvP you better ask around in the forums there, but afaik the bonuses to go after in defensive stalkers are +dmg and +rech, and not softcapping defense, recharge to be in your godmode as often as possible, plus reworking all your build to get only a few attacks like TS, AS, Spirit Shark... I don't even know if LRod is decent for PvP (I'm on a mac now so no access to Mid's).
I started my first stalker over the double xp weekend and I have been enjoying the build so far. I am currently at level 31 and starting to look at IO slotting. Since this is my first stalker I wanted to ask for some advice on my build.
I have my defenses softcapped, but am not sure if my Patron pool is the best selection. Shadowmeld looks good for when I run into heavy defense debuff and the snipe does great damage, but does it crit from hide.
So, take a look and tell me what I could do better and it is a PvE build though if it might be good for PvP I may try it out.
Villain Plan by Mids' Villain Designer 1.601
http://www.cohplanner.com/
Click this DataLink to open the build!
Level 50 Magic Stalker
Primary Power Set: Electrical Melee
Secondary Power Set: Energy Aura
Power Pool: Fitness
Power Pool: Fighting
Power Pool: Speed
Power Pool: Leaping
Ancillary Pool: Soul Mastery
Villain Profile:
Level 1: Havoc Punch -- Mako-Acc/Dmg:30(A), Mako-Dmg/EndRdx:30(3), Mako-Dmg/Rchg:30(9), Mako-Acc/EndRdx/Rchg:30(13), Mako-Acc/Dmg/EndRdx/Rchg:30(17), Mako-Dam%:30(39)
Level 1: Hide -- LkGmblr-Rchg+:30(A)
Level 2: Jacobs Ladder -- Sciroc-Acc/Dmg:30(A), Sciroc-Dmg/EndRdx:30(3), Sciroc-Dmg/Rchg:30(5), Sciroc-Acc/Rchg:30(13), Sciroc-Acc/Dmg/EndRdx:30(17), Sciroc-Dam%:30(39)
Level 4: Kinetic Shield -- S'dpty-Def:30(A), S'dpty-Def/EndRdx:30(5), LkGmblr-Def/EndRdx:30(19), LkGmblr-Def:30(31)
Level 6: Assassin's Shock -- KntkC'bat-Acc/Dmg:30(A), KntkC'bat-Dmg/EndRdx:30(7), KntkC'bat-Dmg/Rchg:30(7), KntkC'bat-Dmg/EndRdx/Rchg:30(11), F'dSmite-Acc/EndRdx/Rchg:30(15), F'dSmite-Acc/Dmg/Rchg:30(34)
Level 8: Build Up -- GSFC-ToHit:30(A), GSFC-ToHit/Rchg:30(9), GSFC-ToHit/Rchg/EndRdx:30(11), GSFC-Rchg/EndRdx:30(50), GSFC-ToHit/EndRdx:30(50), GSFC-Build%:30(50)
Level 10: Hurdle -- Jump-I:30(A)
Level 12: Placate -- RechRdx-I:30(A), RechRdx-I:30(15), RechRdx-I:30(45)
Level 14: Entropy Shield -- EndRdx-I:30(A)
Level 16: Health -- Heal-I:30(A)
Level 18: Power Shield -- S'dpty-Def/EndRdx:30(A), S'dpty-Def:30(19), LkGmblr-Def/EndRdx:30(21), LkGmblr-Def:30(33)
Level 20: Stamina -- EndMod-I:30(A), EndMod-I:30(21)
Level 22: Chain Induction -- KntkC'bat-Acc/Dmg:30(A), KntkC'bat-Dmg/EndRdx:30(23), KntkC'bat-Dmg/Rchg:30(23), KntkC'bat-Dmg/EndRdx/Rchg:30(25), F'dSmite-Acc/EndRdx/Rchg:30(25), F'dSmite-Acc/Dmg/Rchg:30(37)
Level 24: Boxing -- Stpfy-Acc/Rchg:30(A), Stpfy-EndRdx/Stun:30(39), Stpfy-Acc/EndRdx:30(40), Stpfy-Stun/Rng:30(40), Stpfy-Acc/Stun/Rchg:30(40)
Level 26: Thunder Strike -- Sciroc-Acc/Dmg:30(A), Sciroc-Dmg/EndRdx:30(27), Sciroc-Dmg/Rchg:30(27), Sciroc-Acc/Rchg:30(29), Sciroc-Acc/Dmg/EndRdx:30(31), Sciroc-Dam%:30(37)
Level 28: Energy Drain -- H'zdH-Heal/Rchg:30(A), H'zdH-Heal/EndRdx/Rchg:30(29), Tr'ge-Heal/Rchg:30(46), Tr'ge-Heal/EndRdx/Rchg:30(46), Dct'dW-Heal/Rchg:30(46), EndMod-I:30(48)
Level 30: Tough -- S'fstPrt-ResDam/EndRdx:30(A), S'fstPrt-ResDam/Def+:30(31)
Level 32: Lightning Rod -- Sciroc-Acc/Dmg:30(A), Sciroc-Dmg/EndRdx:30(33), Sciroc-Dmg/Rchg:30(33), Sciroc-Acc/Rchg:30(34), Sciroc-Acc/Dmg/EndRdx:30(34), Sciroc-Dam%:30(37)
Level 35: Weave -- S'dpty-Def/EndRdx:30(A), S'dpty-Def:30(36), LkGmblr-Def/EndRdx:30(36), LkGmblr-Def:30(36)
Level 38: Energy Protection -- RctvArm-ResDam/EndRdx:30(A), RctvArm-ResDam/Rchg:30(43), RctvArm-ResDam/EndRdx/Rchg:30(45), RctvArm-ResDam:30(45)
Level 41: Moonbeam -- Thundr-Acc/Dmg:30(A), Thundr-Dmg/EndRdx:30(42), Thundr-Dmg/Rchg:30(42), Thundr-Acc/Dmg/Rchg:30(42), Thundr-Acc/Dmg/EndRdx:30(43), Thundr-Dmg/EndRdx/Rchg:30(43)
Level 44: Shadow Meld -- RechRdx-I:30(A)
Level 47: Hasten -- RechRdx-I:30(A), RechRdx-I:30(48), RechRdx-I:30(48)
Level 49: Combat Jumping -- LkGmblr-Rchg+:30(A)
------------
Level 1: Brawl -- Acc-I:30(A)
Level 1: Sprint -- Clrty-Stlth:30(A)
Level 2: Rest -- RechRdx-I:30(A)
Level 1: Assassination