While differences in the power sets of emps are pretty marginal, ill/emp is the best for team matches.
I can't view the build because I'm too lazy to update mids. Just make sure you have over 1500 hp, 41 KB res, and around 40-50 recharge.
Slot your travel powers well so you can get to people to heal them. Make sure to slot your heals with at least one range IO.
The Ill/Emp build is pretty solid but why have both Phase and Hiber? Your emp would be more useful going with Power Boost from Primal Forces. Additionally, Temp Invun shield is better for an Emp vs Frozen Armor.
Hit points, recharge and KB are all excellent. You're going to pay a pretty penny for the Panacea's.
@Ra Ra
it depends what you build for if you want team buffing you really only slot your ranged atks to build hp. Hibernate is not necessary if you take phase. Once you get good at evasion as long as you prove harder to kill than the other targets they don't go after you a lot.
Code:
drops fitness with accos you have 1575 hp with accos, and with ra, geas and conserve power you can manage your end. Numina proc slotted in ab since you will use that every 90 secs and numina lasts 120.
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Thanks for the input all. The big reason I went Phase/Hiber is for a while I ran just Phase and in smaller (3 v 3 matches) a lot of times I'd have someone phase over with me and keep picking me off simply because the other team couldn't get kills on the emped teammates so it'd turn into a 10 minute match of "Chase the emp"
Granted a lot of those were played with HD/TS on, with it off I could definitely see living with just phase though. I'm definitely used to running with Phase/Primal as it was my old build but there was another emp who I ran into still with the dual phase set up that I thought did pretty well. 
I think I'm definitely going to have to try the stamina-less build though as it stands recovery is never an issue so I might be able to ditch those 3 powers and just stagger like B-Witched said the three 3 end powers. Thanks again!
So after porting my Psi EM, getting ready to move my next toon over to freedom.
I'd have rather moved my Emp sonic (Build closer to being finished) but... until defenders get hibern00b he'll stay shelved.
This is about what I have planned for my Ill/Emp (Possibly skipping out on the Panacea's)
And is there any reason to bring the Emp/Sonic over instead of the Ill/Emp, this is about what his build will look like. Again minus the Panacea's most likely.