Whatever you do make sure the wheel is genuine, seen enough mates with replica nardi's and sparco's fold them in half when it comes to accidents... Same with the snap off if you're going that route, the cheaper 'ebay' specials' wear out stupidly quick inducing a scary amount of play, wouldn't surprise me if it would suddenly unlock on you... I bought the wheel from a website called YBRacing mate, was around £120? it came with a OMP Boss which functionally fitted but didn't have the tab for the Steering wheel angle sensor. The snap-off boss was from Stealthy Garage when they were still abount (used to do JDM Scene kid stuff now they've rebranded to Death or Glory clothing). Ended up picking up the Momo boss for around £40 second hand off here, along with the cruise control panel for another £20-ish second hand off here! You'll also need some resistors to stop the airbag light coming up, cant remember the resistance value but i think they were literally around 60p for ten from Maplins!
Hope this helps