My brothers macbook has lsated over 4-5 years and is running just as smoothly as when it was first bought. Honestly, if you buy another laptop, buy another mac. If it's a PC on t he other hand, buy a windows. You can get stronger and more compatible desktops with PC's for a good bargain. Laptops I'd say stick with macbooks because in general they're extremely reliable, really good quality, and don't deteriorate very much over time. (My general experience). The premium you pay is worth the fact 1 macbook will last 2-3 windows laptops.
Cause someday I'll be OVER 9,000... Rep!