a higher end imac meets all my needs for much cheaper than a MP. I replace the imac every 2-3 years. However, the resale is not very good compared to a MP I have owned. FInancially, over 5 years, is it cheaper to own one 6 core MP, vs buying an imac every 2.5 years? I think it is very comparable. The MPs from 2009 are very useful now, so I think that performance-wise, it works. Any thoughts on this plan? This is a financial argument for equivalency between the two options. Not sure if I am looking at it right.