I flew for a week with Chandler Air Services at Chandler Field in Phoenix AZ. See
www.aerobatics.com. Probably not the cheapest but seem a good outfit and Pheonix is reliable weather (very hot in Summer). Good instructors. Most training in PA28. Also have 3x Great Lakes and 3 x Pitts for aerobatics.
Direct flights by BA from Gatwick. Cost me just £235 in Feb (and I slept across 4 seats out and back).
Interesting flying options, inc Las Vegas.