Hey Joe!!!
Don't mean to be following you around today, but thought I'd throw my 2 cents in here...
What springs do you have on the 04. 5? Do you have the "Starter System" with the 3" Carli front coils and minipaks in the rear? Reason I ask... If you are still on stock springs, go for the Genos 5160s. A better shock really won't do a whole lot with springs that won't allow them to work. If you have the Carli front coils and minipaks, then that's different story. I think it would be worth the extra money to get the Carli tuned 5160s.
HOWEVER, you are going to have to be honest with yourself about how you're going to use the truck. I started with the Lorenz 2. 25 kit thinking that would be all I'd need. Then, when I began to feel what a real suspension felt like, I quickly started pushing things harder than I should've... and in turn, quickly outgrew the limitations of the 2. 25 system. I had the leaking shocks repaired and sold this kit. I now have the Carli 2. 65 Bilstein 9100s and have continued to push things harder. The Carli kit will let me hit the same trails at 60 mph that I was having trouble running 30 mph on with the Lorenz suspension.
So, I guess it depends on your budget and what you plan to do with the truck... just know that it's easy to get carried away and go farther than you meant to. But, if you know that you really won't ever hit heavy high-speed stuff and you'll keep all 4 wheels on the ground, the Carli 5160s should be the last shocks you'll ever buy.
But, if you think you may upgrade to the full leaf pack someday, etc, etc, you probably want to spring for the best shock you can afford upfront and just do it once. Here's where I don't have very good advice. The Carli valved 7100s are $1330. I talked with Thuren concerning my '91. 5 situation, and based upon my budget, he gave me some recommendations for off-the-shelf valving profiles to request from Bilstein. I ended up getting the set of 4 Bilstein 7100s for $695 including shipping. I think that they ride VERY well. I realize the '91. 5 is 3,000 pounds lighter than my '06, but jumping the double railroad tracks feels just as good in the '91 as the '06. I don't have any doubts that a Carli valved set of 7100s would perform better. How much better? I don't know. But for half the price and the budget I had to work with, I'm happy with what I've got.
This may have not helped at all now that I'm going back to read it, but nonetheless...
--Eric