That's a good question. I know that MMD only just recently made 19x10 and 20x10 available. I assume that 20x11 needs to have certain off sets in order to fit properly without causing issues, which is why most want them custom made anyway. I had mine custom for exactly that reason.
Forgestar F-14 20x11 with +56. I have them and they look awesome and fit beyond perfect. My car is lowered a good 2 inches and I've gone into large road dips at 100+ MPH without any rubbing anywhere.
Steeda has the ST-R mesh 20 x 11 +59 and 20 x 9.5 +45. The price is good with the Nitto NT05, I'm torn because I want to run 275 front and 315 rear but they seem kind of flat, not much concave.