Brandon,
I'd go with the box from Enterprise Engines (sorry, don't know a phone #). I actually had one of their boxes when I thought I had hurt mine last year, but once I tore mine apart and found nothing wrong, I sent it back. I believe it was about $350 or so (don't quote me on that) which is A LOT cheaper then getting one from a Dodge, um, dealer (I was quoted $799 plus install).
The hardest part of doing an install of the box is getting the pitman arm off the shaft. I finally had to go buy a heavy duty puller from Napa to get the job done... also, once you have the puller on there, you want to "shock" the puller-bolt by smacking it with something... this will make it come off. I used a 10 lb sledge-hammer on mine, as it was the only thing available that had enough mass to make it move. The lines are a little tough to get to, but not bad. Once you have the new one on, keep the front wheels off the ground and put fluid in the PS pump. Then, w/o starting the pickup, move the wheel lock-to-lock each way about 50 times. It'll get old, and will probably be hard at first, but makes getting all the air out easier. I didn't do it enough, and made a heck of a mess when I finally "bled" the system by removing the pressure line into the booster on the firewall... big mistake!
Oh yeah, use a good synthetic steering fluid too... I think I used Castrol Syn-Power or something like that (do a search for PS fluid and you'll figure it out).
Josh