I'm due to buy new set of tyres on my car, any recommendations or comments appreciated.

Standard tyres are 265/35/ZR18 - 225/40/ZR18.

I was talking to some of the guys that race the challenge cars and they recommended the following as options, they said I will notice a big difference in the grip they provide on the car:

285/30/18
295/30/18
235/40/18

Has anyone tried these sizes on their car, any feedback?

What's the best make that I should go for?

Regards
Simon