Hey Bob, I'm on the same lines with Caleb as I've been wanting to buy that model for a few months now, but the price tag was a little steep for me. I'd love to know if it's justifiable and worth its cost.
Right now I'm usually only shooting for a day at a time without access to a laptop, so I dont really need it yet, but as our trip moves out West and we'll be out shooting for a few days at a time away from the truck, I thought that might be my next purchase.
One thing that you might want to check into, is if you're going to be out for awhile, CF Cards are so cheap now, I carry 4 2gig cards in my camera bag, and you have to be shooting like crazy to fill up that amount in a few days. If you were to carry 4 4gig cards with you, you should be able to go for an extended time in the field before having to stop and download.
One thing that always worried me about going up to the 8 gig cards is I had a 2gig card fail on me one time right before it filled to capacity, and I lost all the shots on it. Luckily it wasnt anything real important, but I've always thought how devastating it would be to lose an 8gig card!
Keep us posted on the Epson