It's probably a 56, possibly a 58. No markings on the frame, and I haven't measured it yet, but it feels a tad smaller than my 58cm CAAD4.

There's almost no info on this ebay monstrosity, but if it's the right size it maybe it'll be worth it just for the fork, and then strip and sell the rest back?

But yeah, you think going with a Nashbar fork might be the best? The touring fork doesn't look bad, but I'm not sure if the rake and the brakes would be compatible.