With that much said, the current 2.7GHz powermac, is really a major no-go.
Future Products:
• PowerMac G5 MP:
-- Dual Core design.
-- Possibility of 3.0 GHz, Probably not going to reach it as no [decent] Dual-Core has yet.
Timeframe: Sept '05 (Paris) - March '06 (IBM time of year) [if introduced]
•?
?Mac
[PowerMac replacement]
-- x86 Dual-boot [Triple+ including Linux flavors]
-- Dual core is easily predictable.
-- PCIe is a given with the appearance in DevMacs.
-- SLI is possible and likely if Apple wants to maintain top end professional image.
-- DDRII Memory
-- Better motherboard by design
-- Smaller Case
-•- You [personally] could use it in your ford office with the PCI expansion/windows for your Ford stuff. [I don't think your a windows fan]
-----> Also VPC 8 [or 9] will allow 2 OSes to run at the same time without emulation (x86).
-- Basically Ultimate in Gaming/Pro Apps/Bragging Rights.
Timeframe: WWDC '06[Myst Prediction] - WWDC '07
So you have the option of buying a legacy computer now that will become a shadow in comparison to the future Intel products. Then again you could just wait with me and my Rev A G5, then buy the Mactel when they come out.
Also noteworthy:
?Book
? [PowerBook Replacement]
-Yonah Dualcore Intel processor
-~2-2.5 GHz
-Apple Designs the best Motherboards, possible performance is huge [http://www.tomshardware.com/cpu/20050525/pentium4-10.html -Dothan Single core predecessor to Yonah]
-Dual Booting
-DDRII
-Amazing notebook, hopefully more expandability/screen improvements
Timeframe: Jan '06 [MWSF] - June '06 [WWDC]
Don't overlook portables, they have a nasty habit of surprising us [Unlike recent G4s, hopefully a pleasant surprise].
My final recommendation is to go wait for the intel and Pimp-your-current-G5 for all it's worth as a legacy computer.