....always better to regret something you have done than something you haven't!
Of my last 4 Alfas the 2 petrols have been ok(ish) and the 2 diesels nothing but trouble.
If you're buying second hand the V6 in Spider form must be tempting -huge depreciation will have gone some way to offset running costs.
Having had the 2.4 I wouldn't recommend it unless you either do 20k per year or drive like a looney as it needs to be kept 'warm'.
Any of the options still appeal more than a Golf (albeit a really good car).