Don't hesitate, buy the Alfa! I too had an A4 until recently; a 140 TDI Avant S-Line that was very capable but utterly 'grey'. It's Teutonic reliability wasn't evident either as the oil pump failed (a common occurrence) and it lunched the engine! I've had loads of Alfas and have yet to have a serious mechanical problem with one.
I did a lot of research before buying my 159 and eventually opted for a low mileage car being sold by an AR main dealer. The fact they even had a discontinued model on the forecourt speaks volumes for its condition. It's great, it communicates with me and does most of the things an Alfa should, except drive the rear wheels. So much more fun than my A4. Don't take my word for it though, go and drive one!
Using yesterday's technology, to create tomorrow's problems, today.