Hi, I have some primes that I use with my 7D. The by far most used one is Sigma 30/1.4 that I really like on the 7D. I use it as a general purpose lens almost as much as my zooms. I also have the Canon 85/1.8 that I use a lot, mainly for indoor sports. In-between I have the Canon 50/1.8 that I actually don't use too much. The FOV it gives on a crop body just doesn't seem to fit very well with what I mostly shoot. But then I don't do too much portraits - the 50 mm focal length on a crop body would be close to a classic 85 mm portrait lens on film/FF cameras. Even if I don't like it too much it could be the best choice for you. The standard answer to a question like this would be to fix your zoom on 35 mm and 50 mm respectively to get a feeling of the FOV. Afterwards you may have the answer yourself. Good luck!