What class is most fun?

I'll admit I know nothing about D3, but at least in EvE, there's a concept of "Effective HitPoints" (EHP), which is HP divided by the hole in your resists: {Real Hitpoints}/(1-{resistance})=EHP . I would think it applies here, too.

Of course, similarly, if healing isn't resisted, then EHP gained by resistances is better than EHP gained by base HP.

Could be. Run speed is more important than either of them, though, since all you do is kite stuff in inferno.

From what I can tell of Levels 1-10, the Monk is the most fun for me.

You can't really tell anything about a class until you have all their active skills unlocked. Demon Hunter was awful until level 26.

I can't get through a2 inferno yet. 50k Vitality, 30k DPS, 100 resist all. (I need more resist all)

Yeah, from what I've read ~500 res all is preferable. You could probably stand to lose a bit of vit, but it doesn't hurt to have a lot. Primarily right now you are suffering from what WW described above. Vit and res all do need to be balanced to some degree.

And in regards to my previous post, I was emphasizing vit regarding wizards. As a wizard, I get res all from my int, so it isn't quite as important for me to get it on gear as for other classes.

I can't get through a2 inferno yet. 50k Vitality, 30k DPS, 100 resist all. (I need more resist all)

Only 30k dps? That without SS?