i have the upper lvl G20 .. had the Lvl59'er as well ..
i'd suggest stick to a driver which is close to the mtr speed of ur irons .. makes for more consistent stroke play ..
once u grab the upper lvl irons with faster mtrs, Burners @ lvl 79, R11's @ lvl 90, then think about grabbing a driver with a faster mtr ..
Incidentally, i have the R9 supertri as well .. very unforgiving, not very accurate .. stick with what u have for now ..