Good work on the hose repair; you can upgrade later, when you have time.
There is allot of counterfeit and junk parts being sold on Amazon and eBay. That link, shows the alternator as a "parts player" brand; the photo, shows a raw pulley without the clutch, which would be wrong for your 1.8T.
As noted, I would stick with a genuine Bosch Alternator; looking on the Bosch parts site, they seem to list 70 AMP, 90 AMP and 120 AMP units, I would go with 120. Then, they offer brand new or reman; I think, mine may have been a reman, although I believe the warranty is the same but might be a bit less, for the reman?
As for sources for the parts; I would stick with a well known local auto parts store that is easy to work with or a online VW specialist. If you are under the gun; a local supplier, maybe the way to go and I got one from my local Autozone, I believe it was in stock or they got it the same or next day. Looking on the Autozone website; they have 20% off online coupons and other promotions going on. They have the Duralast, Bosch, Valuecraft and Valeo brands; looks like Bosch is middle of the road pricing. The alternator recommended on their site; seems to be related, to which type you had in your car originally (either Bosch, Hitachi or Valeo), then which one is recommended. For some reason Valeo is higher then Bosch; go figure, that is why I went with Bosch, when I replaced mine.