Any camber will wear out your wheel prematurely, toe alignment off is even worse. If you drop your car to tuck wheels or anything lower than stock height, prepare to buy camber arms if you want to set camber back to zero, otherwise you're gunna have negative camber. You can buy the figs camber kit, which is pretty baller, but most people can get away with Megan camber kit, which replaces the upper control arm and let's you bring in the camber when you're lowered. Without a camber kit, you're pretty much SOL fixing for the natural negative camber.
As for BCRacing coils, I was about to pull the trigger on a set, but held off for ohlins as ohlins are fully rebuildable, and basically second to none (streetwise). You get what you pay for. I have tried an IS with BCRacing coils and it's not bad, but you may have to get higher spring rates for them if you're low. He had BC springs and the ride quality does suffer compared to stock. Maybe it was his dampening, or even springs, could be many factors. Compared to my ohlins, which are about twice the BCRacing coils w/ swift springs, I felt like It was a huge improvement from stock suspension. I mean everything, in terms of comfort, dampening, and quicker rebound of the wheel.
Whatever rims you get, make sure they fit! With coils and camber kit first, you should be set to handle any tire up to 20 inches.