I had a modern Alpina chronograph and it was a great watch. Don't pay anywhere close to RRP though - even that eBay one you've linked to is overpriced. US sellers such as Gemnation and Jomashop have regular sales with massive discounts. 75%+ off a brand new watch is easily achievable.
$570 for this similar model and they've not even got an Alpina sales event on at the moment: http://www.gemnation.com/watches/Alp...S6B-43918.html