Thats a good idea, what you have now is toy grade
The kinda cars (TC3, Pro4, XXX-S, Evo3) we run are hobby-grade. Another term for specially designed & tuneable and if it breaks you can fix it. Before you get one of these make sure theres some tracks near by or it'll get boring in a hurry
Anyway, I'd reccomend an LRP IPC Pro Sport, At $86 I think its a real good-for-the-money speedo and if you decide to compete it'll be good enough to keep using. I like this one better than my Quantum Comp anyway.