Just bought my first alfa. Its a 147 05 pre-facelift model which has done 48k miles. After much lurking around this site and others opted for the 1.9JTDm.
I love it.
Just thought I should thank you guys for the wealth of information available - I was armed with knowledge when buying and ensured waterpump and timing belt were changed prior to any exchange of cash.
For those interested it cost around £4800 which I felt was a bit steep but they gave me a good deal on part-exchange for my old car and a years warranty.