I give my vote towards Joe's 4x4. I am building his '06 right now, which is a bit cheaper and is 4x2. So far seems like an extremely well designed machine and building it is pretty darn easy with just basic tools and basic knowledge (which I had none of when I started, lol).

Besides, if you buy his plans for 4x4, he gives you access to his forums which are full of people that will guide you in the right direction.

-BK