I'm just not sure how productive 2 weeks would be... If you were going to do it, make sure you have full TSA clearance before you go, like I mentioned in my previous post. Took me 10 days alone to get clearance, so that would be most of your two weeks gone (although I think I was quite unlucky).
Also, it'll take you some time to get used to the flying out there, different aircraft, different RT, different area and airport etc.
I'm doing things the other way round, did 26 hours in Florida and now finishing the rest in UK, and I'd say it'll be a good 10 hours before i feel confident with the planes (newer 172's, more powerful), and the different radio etc.
You could go to America, hit a patch of bad weather or whatever and end up coming home with very few hours of any real value...
Personally, I wouldn't do it, but what would I know...
Stu