Which desktop model Amiga would give the best bang for buck: A2000, A3000 or A4000? Or actually, can you pimp your A2000 so, that it would be on par performance-wise with i.e. A4000? I know that I'd miss out on AGA and some other newer chipset features but what else I would miss out on? What is the difference in availability of add-ons and enhancements between these three models?