I suspect that you're between those sizes, 43 will be a tad bit too small and 49 will be a bit too big.

I'd try both bikes. If you're comfortable with one more than with the other, I'd pay 250 for Trek or 600 (ok, 700 tops) for Specialized. (I doubt that the original buyer of Specialized himself/herself paid more than 1200 for it in '09) If you're torn, look for a bike in the middle, like a 47.