Mate the savox servos around 20quid are brilliant, theres a fast one but has less touqe or theres a slower one with more touqe. Around 18-20. XTM make tidy little servo savers to fit them too.
Are you running nationals end of the summer? First things first you'll need to upgrade to make it reliable. Rear hubs and rear shock tower and motor plate. have a look on end of line for some cheap bits for them.. Other thing is the ball cups and ball ends. there pants, I used k factory ball studs and RC18 cups. if you can find them the 3 racing ball cups for mini t are amazing.
If you want to go all out then try get a full ally front end as it really sharpens up things and fits much better than the moulded stuff. go for the K factory stuff not fast trax. Lots less slop in the k factory stuff. A must is a spring tuning kit, very valuable thing to have. Shocks are around 50wt front and 30wt rear, stand the front shocks up and lay rears down, USE LOSI STREET MEATS lol
Apart from that longs you have the Mini t pro its quite awsome as it is. But keep some diff build kits on you. They wear away after around 3 meetings. I have and have just won the national title with one and its been brilliant i used the exotek tub chassie as its legal, the carbon one can only go into 16th class. put a little weight in front to keep nose down a little. I use a 9kv motor lol turned down alot.