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Since I have a crop body would a 30mm be better than a 50?
I wouldn't say 30 is "better". 35mm on a crop is the same FOV as 50mm on a full-frame. The nifty fifty will give you an 80mm equivalent FOV on a crop camera. I'm personally a huge fan of the 50mm on a crop, and I think it comes down to personal preference. The 85mm f/1.8 on a crop is also great, but again might not be your cup o'tea. I would suggest putting your zoom lenses on these focal lengths to get an idea of what they're like.
Focal length aside, though, the 50mm f/1.8 is the cheapest, best value lens that Canon makes. If you're used to zoom lenses, you'll find that the primes make you think a bit more about framing and such. Also, the shallow depth of field is great fun. I would highly recommend.