kvo & dannygan - I use a mac too! But I use Maya primarily on the PC which is:

Athlon 1.2ghz T-Bird
512mb RAM
1 x 20gb HD
1 x 40gb HD
DVD drive
CDRW drive (external)
nVidia GeForce 4 Ti200 128mb GPU
Twin 17" Monitors
Windaz 2K SP3

Which works fine, although the dual monitors don't work as well on the PC as they do on my old Mac:

G4 Dual 500mhz
512mb RAM
1 x 20gb HD
1 x10gb HD
DVD dirve
CDRW drive (external)
Radeon 32mb GPU
17" Monitor
OSX 10.2.8

Bit tired now, but usable I wanna stick one of those Giga Designs accelerator cards in it - mind you that might make it blow up!

kvo
How does you Mac perform? Especialy the GPU? If I was gonna get new Mac I would get one of those - but they are so expensive...