Basically it all depends what you want them to do. Do you want them to compliment your keyborads and sound good or do you want to know what your keyboards really sound like and you want accuracy. I also depends on jow much you want to spend. KRK are good for the money. I have Yamaha HS8 and I like them. They are pretty accurate and don't color the sound if that is what you are after. If it's just home use you probably don't need too much power anyway. Better go for quality. My hs8 can go really loud.

Why don't you try maybe real pa speakers like Yamaha dxr8 or 10. They are great little speakers and you can use them as a PA speakers too. You never know.