I use HK lead, 88, 86, Nebit, JE. Take first in arena most days, and usually don't drop out of top ten.
HK lead is a must for a good droid team. JE also for his speed and ability to give droids turn meter. Nebit is the new star of my arena team. He has over 73k hp/protection with mods, his taunt with cool down is awesome. His call double assist is good too.
I use this team for GW and have no problems finishing it every day, and usually without losing a single toon.