Well, so how much are you willing to put in to it? And don't forget if you, or someone you know can't put the stuff in, than you have to pay someone else to.
I personally don't know to much, but I have freinds that do. One opinion is that H23's aren't as good as H22's because the H23's are non-Vtec, but H22's are Vtec.
A friend of mine has a Prelude, 4th gen. Really fast breaks 11's when sparying NOS, in a 1/4 ml. But he does most of the work himself, so it's cheaper for him. Best thing to do is get in good with someone who can show you how to do things, or do them for you cheap. And someone who knows how to research and talk to people to get good parts cheaper than normal. But never go with a part just 'cause it's cheap. Buy cheap you get cheap. Always research to see what would be better for your car. The right parts can make your car that much faster. My boyfriend has a Chevy Cavalier, fastest street one I've ever seen without having a whole lot done. All he has is an Exhaust, Intake, FR strut bar, Bocsh plugs and 9mm wires. Ran low 15's in an area where the air for some reason doesn't let the cars go as fast as normal. So, I timed him in another place and he was running high 14's. That's good for not spraying or having a Turbo/Supercharger when Cavaliers can be kinda slow.
The more money you spend the better you get, and of course driving skills have something to do with it! Quick shifting and pedaling is important.
So, like everyone else was saying it's basically how much you spend.