Parallels performance on Mac Pro

I'm strongly considering a Mac Pro purchase to replace not only a Dual G5 but also a Dual Core Pentium Dell. I run large format posters and prints from my home office. I only have the Dell because the RIP software (Roland Versaworks) is Windows only. Can anyone running Parallels on either a 3GHz or 2.66GHz give me some insight as to performance of ANY apps that you may be using Parallels for.
My setup would include either the 2.66 or 3GHz, 4GB RAM and the 250GB HD for starters. I'm going to customize storage with HD I purchase seperately.
It would be real nice to be able to get those two heaters from under my desk!
Power Mac G5/2.7GHz DP, MBP 2.16GHz, Powerbook 12 G4/1.5GHz   Mac OS X (10.4.7)  

parallel currently does not work with the Mac Pro.
The folks at Parallels have said they will release an
update n the near future that will correct the
problem that keeps the Mac Pro and Parallels from
running.
Not 100% correct.
From the Admin user go into the terminal and enter
sudo nvram boot-args="-legacy maxmem=XXXX"
where XXXX is a number. Parallels suggest 1024 or 2048, but for me I had to go-to 4096 before it worked. Then reboot. This puts the Mac Pro back into 32 bit mode.
You can then start parallels again and create & run your virtual systems.
To reset back to 64 bit user
sudo nvram boot-args=""
A screen-shot of Parallels running on my Mac Pro
Here I am running both Suse 8.2 Linux and WinXP SP2

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