Join Date: Aug 2006
Location: Alexandria, VA
Bikes: Firefly custom Road, Ira Ryan custom road bike, Ira Ryan custom fixed gear
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you need to make sure your comparisons are apples-to-apples, so I'd focus on the TT length rather than the frame size, because there's huge variability out there.
I ride a Kona Kapu, it's a 58 (or a 59), and the TT is 59 and change. My buddy, who is a little taller than me, rides a Madone which is a 60...and his TT is shorter than mine.
That said, based on your proportions -- I'd say you could go 58 in a traditional fit with no real issues.