A nicely done conversion on your 3.3 should put a stock e-revo to shame. You'd have to spend equal amounts of jack in motor/esc/battery upgrades to get the e-revo on par with some of these conversions.
You can do a cheap conversion with Feigao 9xl, MM ESC, TrueRC 4s2p 8000mAh LiPo. Runs well, plenty of fun, and easy on the wallet. It would at least hold you over until you decide if you like running it brushless enough to drop for a neu or other high end motor.