I my opinion you should weigh up what you need the car for.
I've a 2.4D Brera, which is great! But they are quirky.
I have a number of odd noises coming from under the bonnet when I use it. I'll have to take it to the garage soon, just to get it checked over.
It also blows NSR stop bulbs like they are going out of fashion. Which are a real pain to change the whole rear light assembly has to be taken off!
I also have a new Mazda 6 to use as an everyday car (about 2000 miles a month). I could have part exchanged the Brera and borrowed less, but i don't want to let it go.
I used to run an E class Merc, which the Mazda replaced. This was a great drive, but not the same appeal as the Alfa.
I could have borrowed the same, px the Brera and had anothere Merc, but I still didn't want to let it go.
All the things folks have said above are right, but with 30mpg at best the Brera is an expensive car to run, which is why I choose the Mazda.......but it's no where near as much fun.
In the end, the Brera isn't the most practial, is expensive the run if your covering a lot of miles and is great.
So have a go....and why not....if you don't get on with it there are plenty of A3's about.