You got about £6k come and take a look at my 156, I'm near Gatwick, it's Alfa red, 1.9 JTD (44-50mpg average), veloce spec, i.e. lowered suspension and sill covers, 53,000 miles, FSH, very nice car and as stated the late cars tend not to have the quality issues of the early cars, nothing but a couple of light bulbs for me. The 156 comes in either saloon or sportswagon, no coupe, that's the GT but you are looking around a starting price of £10k for the earliest high mileage examples. Suspension can be an issue on the 147/156/GT (all based around the same platform), usually the top wishbone rubber bushes go which is an easy job and £30 a piece, other than that they don't tend to have any major flaws other than avoiding the selespeed ones. Maintenance costs aren't too bad, I use local specialists and pay less than my mother does maintaining a Ford KA at the local dealers!
Also A6 is well worth a look, considerably more space than a 156 and good value for money.