The Dual G5s aren't even out yet let alone approved by Digi.
The dwindling supply of dual G4s are priced reasonably.

Comments:

How much of a performance difference do you think will actually be
realised between a Dual G4 and a single processor G5 or even the dual
G5?

By thge time you factor in the cost of even a slightly bumped up dual
G5 and the cost of the 002 you're getting close to an HD1 system.
Any thoughts on the most bang for the buck computer setup for the 002
at this time?