Sicily is the easiest option, and it allows you to control them via bottleneck while they still have three decent cities. Additionally the Sicilian region has some Italian influence, and the regional troops would have that flavor (samnites, Bruttians etc). The Romans also get to fight the Greeks (when Syracuse inevitably rebels to them) and Carthage, who will periodically invade with a 1/2 stack - so the flavor of the Roman enemies will also remain. To join all of the Rome haters, this would essentially turn Sicily into your own little Zen garden of death, with the Romans being the Gladiatorial stars. Actually I plan on forcing the Romans into Sicily myself in my own game as the Aedui, although at the moment I am fleeing north, away from them...