The default rig from makehuman is pretty nice. When loading it with mhx2 it's even possible to turn it into a IK rig.
In this case, the lower legs sometimes transform in a stupid way, because they consist of two parts, even if they normally should be solid. Why?
Also it's not as advanced as the other supported IK rigs from mhx2 like MHX or rigify.
But these rigs don't contain toes, and the toungue also is not as flexible as with the default rig.
So what's the best way to get an IK rig, that's easy to use and flexible?
Probably some modifications to the default makehuman rig.