My tip is dont be stingy. I had the worst tyres on my stock rims, and I lost it soooo many times in the wet, just from turning a corner without acceloration. I now have tyres worth over $250 each and they are a HUGE improvement. The car will now corner faster then what I'm prepared to take it, even side stepping the clutch in the semi-wet is difficult!!
I wouldnt reccomend the Sumitomos I have on my car, purely because of the price. However, if you have the money, go for it!! Otherwise, go for the most expensive you can afford, without going over the top like I did. So many people forget how important tyres are, they are what keep you on the road!!
Good luck!!