If you haven't done any flying, sell your Mode 1 gear. Flying is based on muscle memory. Once you've got the movements down, you don't think about them when you fly. Mix your modes, and you're likely move the wrong control at the wrong time. If you stick with Mode 1, you'll always have to buy it--and it's uncommon here, which will limit your options. You won't be easily able to fly other peoples' planes, either.

In my opinion, keeping what you have at this point makes very little sense.