I'd agree with the arms, but I think the next bumper/skid I buy will be this one:
http://www.t-bone-racing.com/catalog/i246.html
I've busted 1 RPM bumper and I generally don't care for it as it turns the jato into a lawn dart if you come down with the nose pointing down at all. Which basically forces the chassis to absorb all the shock directly.
You may also want to get a turnbuckle or make a plate to tie the tops of the inside upper ball joints together as this has been a weak spot for many. I made a steel plate for mine and haven't had a single issue with it:
I also made one for the rear, but it's not nearly as thick or as pleasant to make. Looks totally hack, but I haven't snapped an ear of the trans case since I installed it. Prior to installing it, I snapped one off both sides within a month of owning the truck.
I'd pull the steering apart and replace the bushings in the bell cranks with bearings. The bushings don't hold up very long and then the aluminum posts they are on wears and creates a ton of slop.
Pick up a spare header and spur gear. The stupid bolt on header snaps at the flange where it bolts to the engine and then your done until you get a new one. I use a different one that I had to bend a bit to get to work after snapping two headers on mine. The one I use now is mounted with springs, so it will wiggle vs crack.