What's wrong with CHEAP hourbuilding?
If you do decide to go to the States(highly recommend it) do not do what I see some time-builders do.
Do NOT drill holes in the sky for 100hrs wasting your time&money in uncontrolled airspace going to uncontrolled airports at 1500ft every day.Go out for long cross-countries,fly through as much controlled airspace as you can handle,talk to as many controllers as you can and most International airports in the US will not charge you a landing fee.Fly high(6500' to 10500' weather permitting)to learn using VOR's and NDB's for your primary nav.
Also good to finally use the perormance charts in the POH.
Time to climb/fuel to climb/leaning procedures/altitudes for best tail-wind(that one is not in the POH by the way) etc etc.
The trick is to keep challenging yourself,if you get bored change the way you do things.
Have fun