Just make sure if you buy a student license you realize the license is a strictly "non-commercial" license. Figured I'd throw that out there, just in case you or anyone reading the thread wasn't aware. This is why Ebay is full of $100-200 copies of Photoshop, they are all academic licenses.
One of the cheapest ways right now to get Photoshop CS, is to buy a wacom intuos 3, because you get a coupon for photoshop for $299. Example, wacom 6x8 $300, photoshop cs $600-650. You could even buy the wacom, get photoshop, then resell the wacom on ebay for hardly much of a loss, maybe $25-50.
Karl