Search the private flying forum as well. Lots and lots of invaluable information there regarding the US and hour building.
Also make the hour building worthwhile and don't just burn holes in the sky. Coming back with bad habits will inevitably cost you a small fortune to correct when you come back to Europe and pick up your CPL and IR training. Find the schools you want to train with for your professional licences and sit down with them and get loads of tips. Then go armed to the US and practice all that CPL cross country nav stuff and direction finding/position fixing, forced landings, VOR tracking, filling out proper plogs. Be hard on your self and don't accept being out of trim. It will all pay dividends in the end.
Most of all have fun. It was a blast when I did it.