I'm running a Lehner Basic XL 4200 w/ 2s on my crt.5 and 16/46 gearing.
If you go with a feigao/nemesis motor, look for a 540L with a Kv rating of 4000 or higher. I think that's a 6L. Lehner's are great but hard to find and three times the price.
There's two sides to every schwartz, he got the up side and I got the down side.