Cheap 20's? Usually cheap = HEAVY, but I've been looking at some Enkei's that are within 1-2 lbs of the stock wheel weight. I'd save your money and save-up for some new wheels. I have the 20's on my 1SS, and am looking to put new 20" wheels on it next summer (when I predict the back tires will be bald). I have my eye on these:
http://www.tirerack.com/wheels/Wheel...utoModClar=1LT
Good luck!