Buy new : More expensive and actually more likely to develop a fault
Yawn .... just how is a new machine "more likely" to develop a fault ? Do you realise just how many millions of dollars Apple ploughs into R&D, part of which takes into account historical issues to make a better new product.
Yes, some of the elder MBPs had errors and problem with the logic boards. They also got too hot. The recent models should be better.
Don't forget the newer models have a completely re-designed chassis.... they now laser carve it out of one solid block of aluminium .... this has a number of benefits, one of which is improved heat dissipation.
See Apple video about new chassis concept and how it is machined
http://movies.apple.com/movies/us/ap..._r848-9cie.mov
I've owned the older models and now own the new chassis based model..... it's a fantastic mobile workhorse ! And the "unibody" chassis is outstanding, there is really nothing else like it on the market, and I've seen what most manufacturers have to offer..... their stuff looks like plastic tat in comparison.