I usually start with Bryan's reviews and actually go past the one I'm looking at to see what improvements they thought needed to be made in the next body version. Of course all that does is make me want that body instead.
What is the primary purpose for the new body? Is it gonna be getting rained on a lot, or is it just more of an inside gig? The biggest problem you might get in to is the small amount of pixels you have at your disposal. You might see the new shots as being soft or wishing you had more to play with on such a big sensor. Lots of weddings were shot with any of those though. Any chance of you spending a little more and getting a refurbished 5dII for around $1475? Menus and button placement are more compatible with the 7d. Buying something too far down the line (like a 1ds) from somebody means you're gonna need new shutters and prolly a new battery. Just some thoughts.