Agreed. I have the 50mm 1.8 and its too narrow for my liking on a crop body. Good for portraits but I think the 30mm or 35mm would be more versatile. I'm in the market for one now..
I just got the sigma 30mm 1.4 art and it's awesome. Much slower AF than USM, but doesn't bother me. Definitely consider it if you're looking for a 30mm for a crop (does not work with FF).
amazon just got them in stock.