If you've been out of nitro for a while, I say just break it in, run it, and see what happens..
As for servos, for steering definitely a Hitec 7955 is the servo to get. Bulletproof.. It will outlast your truggy..
www.towerhobbies.com btw has a near-twin - the Hobbico TS-170 I think.. - for a lot cheaper...
Here it is:
http://www3.towerhobbies.com/cgi-bin...&I=LXNRN6&P=ML
Beyond that, my advice would be, if it ain't broke don't fix it.. And when it breaks...., yeah, just fix it... Good luck..