Alternator defective – new or used?

Hello, unfortunately I couldn’t drive my car today. After 14 days of service life it was all about, but while I was heating up the car, the car went out of the snow. It was not possible to start again. The yellow angel called for it analyzed that it was probably a defective alternator. He reactivated it with a hammer, but to do so he advised to visit a workshop as quickly as possible. Since I am new in Darmstadt, the question arises to me, He has given me an address (Elmo Elektronik) which prepares alternators. ( Cost point for installation and upgrading, almost 80 euros). In a seat workshop you pay up to 500 euros for a new machine according to his specification. It is a Seat Ibiza 1.4 (BJ 2007). So far I have only made experiences (change headlight bulb) with a Bosch service in Pfungstadt. On the fact that I myself have a pear I would be very grateful for advice. New or used? Elmo or something else? Greetings ́ Barracuda317