For being able to interchange limbs quickly and easily while still having what may be the best shooting bow out there, you might want to look at Bob Morrison's ILF bows. I particularly like the Mini-14 riser because it is so short. Various limbs can be used with the riser, but I would recommend Bob's own limbs, either the Dakota longbow limbs or the recurve limbs. Another advantage of the Morrisons, regardless of the takedown model, is that the limbs are not fitted to a particular riser, so any compatible Morrison limbs can be interchanged, so you can buy and sell sets of limbs for any Morrison Shawnee, for instance, without having to send the riser back for it to be fitted. The same is true on some other models of bows.
I agree that there are many great three piece bows out there, and I have quite a few of them.
Allan