I agree with using rattle can paint on non-fancy wheels.
I've used the FL3 and the Sharpe. Both work well tho you can buy 3 other tips for the FL3, 1.2, 1.5, 1.8 and 2.2 if my memory serves me(I might be off a .1 or so). Mine came with the 1.5 and I purchased the other 3 and use it for general work and primers.
If you really get into painting, then Iwata and SATA guns will be on your wish list - but do cost a significant amount (lots) more