106 or 306 Track Car

[1616six]

If you want a peugeot 106 gti for track use but they're too expensive you can pick up a tatty saxo vts for next to nothing these days.

I was about to say this, VTS is probably the answer for budget/power if you decide the 106. I personally would go for one over a '6 purely on the basis of having something a bit different for the track.