I've yet to regret not getting the extra 2.8... if I want more speed in the future... I'll sell my 2.8 to someone that needs it and buy a single 3.2
Another GREAT benefit to the Quad Core vs the Octo Core... MUCH LESS EXPENSIVE to upgrade the CPU Speed in the future ;-) hehehe
It great that you love your Mac Pro but surely buying another 2.8Ghz chip would give you er another 2.8Ghz (well actually 4 times that, for each core) of power where as upgrading to a single 3.2Ghz would only give you 0.4Ghz (times that by four for each core) of an increase. Is that not correct or am i missing something?
Also someone one here said that the 3.2Ghz use a different motherboard to the 2.8 and 3.0's, i'm sure if that's true but it would mean you can't put a 3.2Ghz chip in.
I don't mean to piss on your parade, they're just two (pretty big) holes that i saw.