Welcome to the world of bass rods.
Personally, I would stick with what you have already. You seem to really like it. The sad news is if you bought the Med. Fast you would soon find that it was not really well suited to many applications either.
A good rule of thumb is that Med. power is good for treble hooked baits like poppers. and a MH is good for single hook baits like senko's.
If you get serious about bass fishing your gonna own a half dozen rods or more pretty quickly, so you may wanna get started on that letter to Santa.