Wait untill AFTER you finish the class to buy a digital camera. Most beginning photo classes require you to shoot black and white film. If they don't they should.
When you buy an SLR you are buying into a "system". First you buy a body then some lenses and then the next body will have to fit the lenses and so on. Pick a company that you know you will still like in 10 years . Already you are seeing this, that EOS lens can be put to use of you buy a Canon digital body. Try and predict the future by looking at what each company has done in the past.
With a light budget look for good used equipment. Digital SLR bodies don't hold value well which is a good thing it you are a buyer. A two generation old Rebel can still do good work.
Ask the teachers who will be teaching the class, many still do use B&W film. That really is the best way to learn the basics