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When you say "go to the track" what do you mean. Are you doing drag, drift, lapping or Auto-X? Are you in a specific class or just out for fun? There are a lot of things you can do first to make the car handle better before spending money on coilovers
I have the RS*Rs and love them. I'd recommend them but I believe they're discontinued and almost impossible to find. If I had a second choice I'd go with the BCs personally.
You will never get a straight answer with a question like that
I heard the Tesla Coilover kit was the best bang for your buck, affordable and shockingly good quality. I was going to get them, but decided on springs instead.