wdlove said:
I'm curious, have all the problems with Rev. A been corrected in Rev. B. such as noise and electrical?
Is there really a big difference between the 9600 XT & 9800 XT video card?
Should there be any concerns with the new water cooling unit in the new 2.5?
My nine-month-old dual-2 has had zero electrical problems, and even with the audio hooked up via optical to a stereo, I've noticed no audio problems, so I suspect a bad bunch of parts that affected only some G5s. Or perhaps I got a good bunch of parts that helped only some G5s. In either case, I'd guess that the audio stuff has been solved long before now.
As far as electrical is concerned: as part of diagnosing a problem that eventually led to the true culprit (my 20" Cinema Display's power button), I was informed in November that they had a new series of power supplies for the G5, so I suspect that any problems were likely remedied by that, although, again, I've had no issues at all.
There
is a big difference between the 9600XT and 9800XT (assuming they're annything like the 9600/9800 differences, or the 9x00XT differences in the PC world - the 9800XT is substantially faster.
However, you need to decide if the speed bump is worth the $300 premium. Personally, my "ancient" 9600 (non-XT) still works fine in all that I do, including the occasional game (Halo, WCIII, etc). So my guess is that, unless you're an avid FPS gamer, the 9800XT would be a waste of your money. Just my opinion. YMMV.
As far as water cooling is concerned: it's been used for years in other equipment, so I think the basic technology is sound. I'd strongly recommend AppleCare in any event, and that would cover any problems shoudl they occur. However, given that the G5 case is stronger than most tank frames, I doubt anythings going to muck with the water cooler, and it's very unlikely that, internally, there will be corrosion issues. Again, it's possible, but that's what AppleCare is for. I don't think you need to worry about it.
Of course, if it's a big issue, I'll sell you my dual-2.

We're both in the Boston area...