Yes - I do indeed have long legs, and a short torso. My current commuter - Marin Hybrid - is on the large side, and while the stand-over is "perfect", I find the cockpit, even with a short stem, to be uncomfortable on long rides. I also favour a steep-ish saddle to bar drop, and the height of my cross bar is sometimes a little scary if I have to come off the pedals quickly.

From the feedback above it seems:

1) 57cm is ballpark OK
2) the bike might be a tad short, but this can be corrected with tweaking some parts
3) the fact that I like an "agressive" saddle to bar drop might correct / compensate if the bike is indeed a tad short ???
4) my short torso might like the 57cm

If the fit can't be tweaked enough for comfort on long rides (150 - 200 miles / week) I guess I can always convert it to a SS for around town use.