Fly the cheapest and/or something different from what you would be flying in the UK.
Flying the same type of aircraft all the time is a little boring. I flew a aeronca champ out in florida some 15 years ago. It was only a couple of dollars more than a 152 and was great fun to fly. It's also handy if I ever want/need to fly a taildragger again as I shouldn't need so much training.
The same applies if the flying school gets a new aircraft or you move house and have to change fying school which uses a different aircraft type. As you will need less air time on your check out ride.
I would also suggest getting checked out in a couple of 4 seaters as well. As if you want to take a couple of your friends up it will make the check out quicker cheaper and probably safer.
In the past the more different types I flew the more the quikcer i found it to convert to another type. It also resulted in me making more of an effort in reading the flight manuals.