Quote:
My other main concern is whether it'll be able to support my monitor at 2560x1600, but that probably relies more on the capabilities of the video card in this machine (I have no idea what it is).


As you properly pointed out, it will be the job of the video card to support it, and a quick search shows your machine has this Intel integrated card with the following specs:

350 MHz DAC for 1800x1440 @ 85Hz max CRT resolution or 2048x1536 @ 60Hz max FP resolution

So, it looks like it will not drive the 30 inch LCD at full resolution, as it is not a dual link DVI capable card.