RVR800's point 2 is the most important one. You want a CPL which requires 150 hours in your log book to start. This flight time is supposed to indicate that you've got some experience and so will be able to cope with the very short course leading up to the CPL Skill Test. If you just convert petrol to noise as fast as you can in the US you'll end up spending extra money back home trying to pass the Skill Test. Get some experience out there - fly a complex type for some of the time. Concentrate on nav technique (not track crawling) and do some GH and IF if possible. Find a CPL instructor/examiner before you go and ask about the exercises you'll need on the skill test.