Re: Hello from OZ
You can certainly get V6 156s and 166s in the UK for under £10,000 - but then that's about €15000. However, I'm sure they can be found for nearer your target price.
I'm not expert on remaps, but there's plenty of people on this forum who are!
Be aware that technically, the speed limit in most European countries isn't MUCH more (if at all) than 110kmh or 70mph. France has raised a lot of its motorway speed limits to 80mph (130kmh) and around half of the German motorway network is de-restricted. The UK speed limit is still 70mph/110kmh, although how rigidly that's policed depends on what motorway you're on and in what part of the country!
Hope you get an nice Alfa and enjoy your stay in Europe.