Your bread-and-butter powers are Corrosive Enzymes and Regrowth, and Spore Cloud and Lifegiving Spores are both good field effects. All four of those are up basically whenever you need them (even unenhanced, Enzymes lasts twice as long as its recharge). There's four very long recharge powers, but one's a rez (always are) and one's a long-duration power (sort of a 'regeneration aura' type power, but for +res as well as regen).
So that leaves Wild Bastion and Overgrowth. Wild Bastion enhances to about ~2min just on SOs... but to be honest, I feel it's skippable. It's nice to have the oh-crap button, but I think the raw healing the set puts out makes it kind of meh. Overgrowth is a much more interesting power since it's fairly long duration and a very good offensive buff. Even if you can only keep it at like 2/5ths uptime, it's still a great power.
Edit : Oh, as far as synergy. Well, I haven't played with it much, but it looks like a great support set for anyone. It's kind of clicky, so I'd lean away from Corruptor, but it's a very solid healing set with good +res. Controller is my first choice but you could make an effective Mastermind with it (especially with a KD pets, and you can supplement it with Leadership or other pools (I'm pretty curious how the new Presence is going to play out) to make a strong Defender.
Good ideas for synergy are as follows as seen on test and in beta, they are not in any particular order just putting up what comes to mind first and so on.
Defender/Cor
DP staked -dmg effect can effectively get sustained 70% debuff going (note with building numbers have been shown in the 90's for ST)
Sonic -res stacks well with many of the effects of NA (recommend taking dark as a epic to gain even more dmg)
Psy -rech from psy adds a good second layer of protection with the -dmg NA puts out
Dark since NA has a Tohit debuff aura more tohit debuff just keeps you alive longer
Troller
Plant, This is a no brainier but plant makes everything awesome
Dark again provides extra -tohit handy to stack
MM
Anything should work well here lots of buffs to bolster pet performance
As always all statements are IMOHO and YMMV
Demons might be better as the -res can be stacked with NA's
There is but one truth. Time is limited. ndnw its over
I'm not too sure about all the Very Long recharges. How well can you mitigate these recharge times? Will it take a ton of rare IOs or will many of the powers sit unused every other mob due to recharge? What will provide the best synergy to the set? I'm thinking of going controller but am looking for some feedback first.