+1 I was thinking of doing the same thing that you are doing a little while back and I came to the conclusion that it wouldn't be worth it. Look at completed auctions on Ebay to get an idea of what you might get for the frameset and various parts. New high-end take-off parts tend to end up selling at a fairly consistant price. With lower-end stuff, there is much greater disparity in the auction end price. It's really a crapshoot. I know that that Rival BMC bike for $1500 would probably fetch a pretty decent price for the frameset, but then again it costs a bit more than the others that you are considering. Good luck.