Dutret, I remain unconvinced. With a threadless set-up, it seems that you can buy one stem and have many different possible vertical adjustments. With a threadless set-up, you have to buy a new stem if you want to go higher (unless you had the foresight to leave yourself some tube to work with).

Regarding the OS tubes vs. "regular" tubes... you're probably right. But frankly, I'd rather ride a bike that looks nice. Even if it does happen to be a couple hundred grams heavier.