Whichever one you decide on I'd suggest getting a USB controller for it too, using a proper controller via the training port is a pain (it's using it's batteries whenever you use it, which can get expensive or annoying having to change/charge them all the time).... USB controllers are only about £20 from Ebay and seeing as a decent sim will already set you back over £100 it's not a lot more.
Or if you're on a budget, just get the controller and they normally come with one of the free sims, but the free ones tend not to be that great.