Single or double processor for music use with a Mac?

Hello, I have been using a PC for years and I want to convert to a POWERMAC to use for music 9using software such as Logic, and Pro Tools).

I am a little undecided as to which machine to get. Advice given to me is that I should go for a single processor G5, but I have seen some good priced dual processor G4 machines at the moment. Also someone has told me that a single processor G4 should be fine.

I don't know which way to go. I'm more inclined to go for the Dual processor G4 with this spec:
Dual 1.25GHz PowerPC G4
2MB L3 cache/processor
512MB DDR333 memory
80GB Ultra ATA drive
DVD-R/CD-RW drive
ATI Radeon 9000 Pro
64MB DDR video memory
56K internal modem

Does anyone have specific advice for use of a MAC for music using lots of audio.

Thanks
Marco