Look into a 57cm LeMond Sarthe, 2005-2007,all good. LeMond has some aluminums in what I sense is in your price range. Composite, part alum/steel with part carbon fiber should be considered. Athough my dimensions aren't as outlandish as you mantain your's are. I DO have a long torso, I DEFINATELY can FEEL a difference in LeMonds geometry, even more than the stem-swap-game that I've used. 2005 and 6's can be had at a discount,for that matter e-bay has had some near-new ones, I'm talking bikes having mileage in the double digits,demos etc. The geometry makes the bike risk-free, you'll probably(almost for sure) appreciate them. No other off-the-shelf has such long top tubes. 57.5cm for a 57 ct seat tube size.