9252's are good, 9452's are better, 8717 or bls451s are best
yup, I'd second that.
I wanted to get some servos recently, wanted to be sure they wouldn't be the weakest link. I went 8717 over the bls451's because I read one too many threads with issues and of course the big hurrah about 'no for helis'. I figured fine, then I'll go for ones that are the same price, speed, torque and made for heli's and I'm very pleased with the 8717's right now.
You could think about keeping it down to something like 5625 to save some cash now, and for the next machine wait for what will be released later. Should be some killer new servos soon. Futaba will be releasing Heli brushless, Hitec has new digitals on the way, and I'm sure JR will want to keep up in the brushless area.