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I would stick with at least a Nahelam system. I'm not looking to start a fight here. That's just my opinion.

My reasons:

1) SATA optical drives
2) Slide-out tray could possibly lead to easier CPU upgrades
3) Faster, cheaper RAM
4) Better graphics out of the box
5) More RAM/bigger HD out of the box

If you buy a 2.8, you're buying an older model. This may not be a big deal for anyone, but if you find yourself in a situation where you need to sell your MP, the newer model will have a better resale value.

It's your money. Both choices are good, but if it was my money, I'd buy and new one.

....And I did.

Most negativity in these forums are from people who've never owned a workstation or they are defending their last generation vigorously. Anyways....Good luck!
1.) extra sata ports in 08
2.) sure, if you have the octo. :)
3.) cheaper? if you want to max out at 8 on quad...
4.) true.
5.) true. though hdd space is cheap, very

negativity towards octo/quad? id get the octo, i would not get the quad.. quad is a joke. 8gb ram limit for a professional workstation? i guess
 
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