It's becoming more and more common for the 02M six speed found in the first generation Audi TT and some special editions of the VW Golf and Jetta to drop out 1st and 2nd gear. This is caused by a broken rivet that secures the 1st and 2nd gear shift fork. Don't replace your easily repaired transmission with another one that will likely fail for the same reason. We can repair your damaged transmission, replace a few seals and upgrade your clutch for about half the price of replacing your transmission.
Here's what the repaired part looks like, the broken rivet that was replaced is just to the right.