If you liked how your TC3 drove then I would suggest the newer TC4, the Yokomo SD, or the Tamiya Evo IV. All these shaft driven cars are great and competative. If you are leaning to go to belt then the best I have drove or seen run is the Tamiya TRF 415. It comes fulley hopped up and it seems to be able to take a beating, and also it is the World title holder. Other belties worth looking at are the Xray T1 FK, shuemacher, the new Losi and the Corelly.
All of the cars mentioned are fantastic but not all suit your driving skill or preference. My best advice is to go to the track where you plan to race and see what works best at your track. See if anyone will let you try there car, if they do and you like how it handles then make a list of the ones you like. I have let guys drive my Yokomo and now I am finding that they are getting Yokomo's It is all up to what you like. So go and find out what is best for you, not what is best for everyone on this site. SHAFT/BELT it doesn't matter they both win they both lose.
HTH (Hope this helps)
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