Transmission out, looks like an Audi trans, what should I look for?

[VII]

Hello, hello! So I finally got around to yanking my 98 2.5 5sp Boxster transmission because it was not shifting into reverse and was having a difficult time with all other gears. Cables and such were fine and I used the Porsche centering tool to align everything and still no dice. Anyway, once I got it out and looked it over I saw VW and Audi stamping and I'm assuming it to be an Audi transmission from the stamping LAU 012 301 211 R.

So, now that I've got it out, where should I go? I can pop the transmission open and poke around, though to be honest I don't know what I'm looking for. Or I can go to the local Upull and yank an A4 tranny for $100 but what years should I be looking at? I don't really want to go with a Boxster trany because I could get several A4 transmissions for the cost of an inexpensive, high mileage 2.5 5 speed.

Thoughts? Thanks in advance.