My thoughts on the 08 mac pro.
First, I'd like to say that I used to own a 3.2ghz 2008 Harpertown myself and let me say that this is one of the finest computers I have ever owned.. Fast, furious and very efficient.. however, there are a few strikes I'd like to bring up with the 08 mac pros.
1. If you plan on using SATA drives inside the 08 and disconnecting the IDE, you need to know the limitation that the firmware, of which apple on-purposly crippled, DOES NOT support booting into Windows or any other OS via the ODD_SATA ports which is very sad, as we pay good money for great hardware only to find out that Apple did something to limit our capabilities.. While a workaround has been around for eons now, still there is no real way to boot windows from the startup selector by choosing a sata drive connected to those ports. The next best thing to to use ahci.sh and mod the master boot record of your bootcamp drive and install the ahci drivers.. AGAIN, this doesn't allow the mac to boot the drive, but it will be available when the OS loads up.
2. The other limitation is VT-X. While the 2009 mac pro owners got an update to fix this, the 1.3 firmware for the 08 was SUPPOSED to fix this, and although I called and bitched about it to Apple's engineering, they were able to duplicate the problem and promised a firmware revision. THIS NEVER HAPPENED.
3. You can't use the 3.4Ghz processor which is the x5492.. sadly, for some reason the logic board won't recognize it and though its of the same x54xx family, the 3.4's don't work.. I don't know why. But if one can put a w3580 in a mac pro 2009 quad-core which came with a 2.66, then why can't one put the fastest harpertown in the 08?? Really sad.. Now, has someone tested this with the 3.2 logic board, as the 2.8/3.0's have different logic boards from what I can see just in thermal dispersion of heat or something.
Conclusion,
The 2008 Mac Pro is an excellent machine and does quite well in keeping up with the latest Nehalem architecture(very precious software is written to take advantage of it, except for a few apps), but with the limitations above it kind of begs the question as to whether or not its worth it to consider it? Had the ODD_SATA situation been resolved, I probably would have kept it. VT-X is a minor problem, but for some of you it isn't.. I sympathize greatly with all of you who need odd ports and vt-x. I tried myself to convince Apple, but no success. But, if you can get an external USB drive(windows won't boot off firewire or any other drive to my knowledge). Yes, I tried the owc mercury extreme with esata and it didn't work.. USB, however did. So, if you need a drive to boot windows off of and prefer to use the odd_ports, consider the alternative USB. YEAH YEAH.. ITS SLOWER, but its better than nothing.
I have gone to a 2009 mac pro simply because I did not want those limitations.. but don't let that bother you, unless you intend to make use of those features which thus far are absent on the 2008 harpertown mac pro.. 2006-2007 can boot off the odd_ports, but the 08's can't.
Now, everyone yell at me!