I still enjoy Thanimal's Quad H build, you can find it
here. It's a bit dated but I use the exact same level split with updated enhancements. You end up with more healing than I've ever been able to go through, even without shrining. And soloability? Plenty. I've done Cult of the Six (the entire chain) on elite at level 8.
Another great solo build is the basic WF Sorc. Pure build, I usually go with air first and switch to earth at later levels.
And then, of course, there's the DDO easy button. Aka Pure WF Artificer. Not much use in epics (in my experience anyways), but in heroics you can pretty much face roll your way from one to twenty.