That 2.5 will definitely be a sweet machine...although I don't know if you (or I) would want to be Apple's guinea pigs in their foray into liquid cooling. Sure, we all say, "well it doesn't really matter since it's covered under AppleCare". That's true, but if that thing leaks, you'll basically have to replace the whole machine and deal with a lot of inconvenience. Liquid cooling is by no means new, but it is new to the mainstream market and can have untold problems when applied across a much broader user-base. If apple-x.net ever comes up again, check out the pictures they posted from the service manual along with the description of the fluid - it goes into pretty graphic detail about what the service provider should do in case the unit blows up - kinda scary.
That said, I don't blame you for lusting after that beast. Looking at those pictures of the cooling system, it looks more like under the hood of a hotrod than a computer.
I've been wanting to upgrade my graphics card in anticipation of Motion - I'd be interested to see some benchmarks of the 9600 XT - I've read here and there that the OS X doesn't make use of the VRAM like it should, making the graphics chip the important factor in graphics performance. Check out barefeats.com again for the 9800 shootout. There's very little difference between the 9800 with 128MB vs. the 9800 with 256 MB, while there's a world of difference between the 9800 and 9600, due to the different chips.
That all being said, I'd be interested to see how the 9600 Pro stacks up against the 9600 XT.