I found a refurb white MacBook (6,1) at a reseller. It's $650, not including sales tax. I've been thinking about getting it, since it would be a way for me to get a Mac without breaking the bank. As far as I know, the white MacBooks will run Lion, but how well? And will this one run Mountain Lion? It's only got 2G of RAM; can I upgrade the RAM in this machine? What do you all think? Should I go ahead and bite or wait for a mbp? Thanks!