Was browsing through CL and found this Soma Smoothie frame :


Looks like a nice frame and a good project. I am just trying to decide if it is worth the $$ and effort since I already have a Centurion Ironman. Would I be building up a very similar bike here?

According to Wikipedia, Tange has three lines of tubes: Infinity, Prestige and Ultimate. The Soma is prestige frame with with a infinity folk. I think my ironman (not with me right now) has Infinity tubing. If it was reynold I can quickly assess the difference but kinda lost on the tange series. Does someone know the difference/history/insider story?