This is quite interesting. If you plan to do the FAA commercial as well as the JAR it is worth bearing in mind that the FAA require you to do the trip SOLO and that you must land at a point at least 250nm (in a straight line) from your starting point which in practice will give a trip of about 550-600 miles as an out and return.
When I did mine, I managed a trip which would meet both the JAR and FAA requirements just in case. (it works out cheaper anyway than doing two trips).The differences are subtle but they are substantial.
It does means doing the whole trip on your own and that is more challenging.