Check it on Mids. Remember, you've only got 120% while hasten is up, you have to account for the downtime too.
Eg: i've got 75% global rech, not permadomination, nor perma hasten. Iirc, you need 120% *global* rech, that's not including hasten. Hence sets that can boost their own rech (illu/rads being a good example), get it easier
You need 275% +rechg from enhances, self-buffs and set bonuses to perma it (450/120 - 1). For some sets with +rechg powers, it's not too hard (especially kins who can stack 2-3 siphon speeds). In your case you still need about 50% more +rechg to get it perma (don't bother with extra slots in Hasten though unless your only goal is to perma it).
CoX 50s: <ill/rad> <ice/ice> <fire/kin> <grav/sonic> <ice/storm> <earth/kin> <kin/elec> <cold/psy> <thugs/dark> <fire/dark> <dark/elec> <night widow> <EM/ninj> <mind/icy>
Most Doms with perma domination will have perma hasten as a side effect and it was possible before purples were available so much easier now.
Not sure if it can be done for every combination of powersets (probably not) so some idea of your's would give a better idea as to how to get there.
Mind of Gaia lvl 50 Defiant's first Mind/Storm 'troller.
Deadly Doc 50 Dark/Dark Corr
and lots more on Pinnacle,Union and Defiant
You can get it on doms as for other AT its harder ive got it to 10 seconds down time on my stalker but cant get it any better than that
I've seen perma hasten achieved on a Sonic/Rad corruptor whch btw seems a very powerful combo 
I've got StT set up with 3 slotted Hasten all with 50 IOs, plus recharge sets which total 50% increased attack rate, so with Hasten thats 120% and I'm still not Perma Hastened, has anyone managed to get perma hastened?
Anyone any idea what I can do to get Perma? Would 3 more rechamre slots work???