Yeah man.
You seem to be more than just living on the edge, you are looking for it.
I mean, I don't know many people who would sell a reasonably fast and reliable machine and consequently accept to have to live without a production machine for a month or more expecting 'something big' would happen on MWSF.
If I were you I'd buy the faster iMac G5 and run my old software. OTOH, the new iNtelMac can drive an independant second display which is a huge plus when editing video.