I have a g4 flat panel imac. I bought it 2 years ago before I new anything about macs, it became my obsession. If you are able to sell it and get something with open architecture (spelling) do it, I cannot stress that enough! I wish I went with a quicksilver instead of the imac (but it was sooo pretty). Check out macdocs site on some digital audio powermacs or check out ebay for some good deals. Example my buddy has a 500mhz DA Powermac, it scored much better on xbench even though the components in my computer are 'faster'
You are not your khakis.