If you really want a good combo, get rid of your sub and buy a new one.
The M3 and M22 are different sounding speakers. i hear the m2i is close to the m22, so if you like its sound, and you want to upgrade, get the m22.
the m3's have a more laid back sound
all three of these speakers do not have great bass extension and require a sub to sound complete
save your money, and buy a better sub. purchasing an external crossover is money for nothing, when you can put that money and the money from returning the sub to buying a better sub.
