I'm a Windows-user at heart, but as I work more in web development, I'm understanding the need to work on a Mac. I have the opportunity to buy a 13 in 2009 Macbook Pro (2.26GHz) for $500. Memory has been to bump it up from 2GB to 5GB and it has an updated hard drive. There's no way I'd buy a Windows laptop that is nearly 6 years-old, but I know Macs last longer, but how much longer will this last and be able to make OS updates? Any thoughts?