Yeah, Kit is about the cheapest you can get. I used to buy that, buy not anymore liao, coz it doesn't really work.
Yeah, black colour cars are damn nice, but the negative thing is the visible scratches lor. For swirl marks: if you want to just "cover it up", then buy Featherlite, or Meguairs. If you want to remove them permanently, then buy Meguair's Scratch X. Professional detailer works also, but the price will be abit high.
http://i76.photobucket.com/albums/j7/munpeng/100-0001_IMG-1.jpg