I bought my 1.9 almost a year ago. Being an ex companu car high mile driver, I knew that every car I had sent back had a virtually unused clutch and had just spent it's life going up and down motorways.
I bought it 3 years old with 122,000 on the clock and today it's almost at 138,000. I've seen many examples with higher mileage.
The problam areas were the dpf and egr (as is the case for many modern diesels). I've spent about 450 on it this year, including winter tyres, rear discs/pads, a window regulator, an upper suspension arm, a service and the MOT: I carry out all my own work but in all honesty a descent garage wouldn't have found any other faults either.
Look after it and show it some respect and you'll be happy enough.
I opted out of the company car scheme to buy this car. My boss was wary, and some colleagues reminded me Alfa's reputation. The tables have been turned because they drive Volvo V50's which suddenly lose power as you set off from a junction, or VW Golfs with odd misfires.
By comparison my car is the most reliable of the fleet
Find the one you like (The Ti is worth the extra bit) and enjoy it