OT: PS2 performance on Mac Pro

I'm sick and tired of waiting for the mythical x1900XT G5 PCI-e edition, and I'm considering a Mac Pro with that card and 3 GB of RAM. I know from reports here that it should be quite fast with Aperture, but what I'm concerned about is Photoshop performance. I do most of my editing in PS2 (using the open in external editor command). The image files start out at 45 MB or so, and are often at 150 MB by the time I save them again.
My current set-up is a dual-core G5 2.0Ghz with 2.5 GB RAM and Raptor 10k RPM boot drive, using a second 400 GB HD as a scratch disk in PS2. I'm wondering how PS2 performance with a 2.66 MP + 1900XT + 3 GB of RAM would compare in "real world" usage with my current set-up.
My other option would be to get a ridiculously priced 7800GT for $800 and bump up RAM to 4 GB on my G5. But I figure I can sell the G5 for $1800 or so, and for a few hundred bucks more get a MP instead of sinking money into an older machine.
What do you think?

Sell the G5 and buy a MP. At this time of year it
often makes sense to wait for MacExpo SF January 8,
because new choices will be available (almost
assuredly quad cores) and prices of today's best
boxes will lower.
Hmmm... tricky. The MP boxes will be cheaper, but the resale value on my G5 will be lower too. I wonder if there's an advantage either way.

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