I have a Power Mac G5 (dual 2.0 ghz) from 2004. Not a problem for what is now six years. It is currently my full time desktop computer. Meanwhile my iMac from 2007 (Snow Leopard) is slow (surprisingly slower than my PowerMac with PPC leopard). I'm convinced that Mac Pro is the best bang for your buck if you don't (want to) buy machines often.I plan to buy a Mac Pro when this one finally dies.