At first i was thinking along the lines of 3dkFrost+2shokadins pvp, and variety of similar team in pve for more controlled heroic progression, like 1blood+2frost+2holy, or prot+3frost+holy, or even 1blood+2frost+ret&holy =3

Honestly I am sold on 4dk+pally team for both pvp and pve, but with fact that pally could be specced in such way that it could output considerable dmg when needed or possible to do so. Just like feral can switch on the fly from kitty to bear in midfigh when situations calls for, so as shokadins have such convenient option to switch to healing on the fly, well at least i presume that there little to no downside to it, but it is only just a theory...

As is, I don't see downside to 4dk&pally, but i though 3dk&2pally had some kind of unprecedented robust flexibility =P
and my first thought on dk+4shokadins was "immortals" lol