I bought a set of used JR 8717's for the cyclic servos on mine. While they've been great servos, the one thing I really don't like is that it's kind of a PITA to get JR wheels to get along with the Synergy CF servo arms. I mean, it's not like an epic endeavor to make it work, it's just a lot nicer using servos that have the Futaba spline.
I just installed an Outrage Torq BL9188 as the tail servo today and flew it for the first time. Seems like a really sweet servo. I bought it on Black Friday for under $100.