50mm f/1.8 is a prime lens thats worth to start with......... then when you find its usefulness, go for the f/1.4. But I am fine with 1.8, so still sticking with it. Spend your money wisely, buy what you need and that you enjoy it. Cheers!
go for 35 mm. that is closer to a normal lens. i blur, bought 50mm thinking it was a normal lens. but turns out that on a crop frame camera, it's a medium telephoto.
i still find it very useful as a fast lens though. but now i feel like getting a 35mm prime as well. had i started with the 35mm, i would not really feel the need for a 50mm. it's easier to go closer than to go further IMHO