I'm going to buy a new 13" MBP, and am tempted by the SSD, but the price is so high! Is it possible to get a 7,200 rpm HDD which fits in the 13" MBP? If so: Which one/s? Where to buy? Where could I find someone to fit it for me (Hastings, South-East UK)? Most importantly, would it void my warranty or anything like that? Please be patient and help me-I am quite new to using computers. I would not feel comfortable opening a computer myself, and I don't know anyone I could ask.