I saw the i760 in the store yesterday, and it's nice (I like the keyboard) but it's no smaller than the 6700. It's as long with the antenna (just about) and only a hair thinner. And the lack of REV A for a brand new phone is a major negative
The 6800 is still not out on vzw, and though it's capable of Rev A, it is not that much better than the 6700 from the one I played with. Sure, it has more memory (storage) but with the WM6 kitchen I use, I have 37+M free with everything I need installed, so who cares..
And it's the same size, practically (without the antenna, but only a hair thinner).
I'm just planning on getting a seidio 3200mah battery. I picked up a new 1500mah slim on ebay for under $20. So between the two they are fine. Battery life is probably better on the 6800, but is it worth that much more cost?
If you can get it for about $100, I'd go for it myself. But....