It really depends on your budget.
Old Man Emu makes a really nice shock, though I am not entirely positive but I think they can be used without a lift.
Bilstiens is another option
KYB Monomax is a good on/offroad shock also, I think they have an adjustable as well
Rancho has 2 types of shocks, RS5000 nonadjustable and the RS9000 which is adjustable. I went with the RS5000 with my 1.5 in lift. they were listed as direct replacement with 0-1" applicable. They were much fatter than my beat up monomax's and required me to grind about a 1/3" off the edge of my bumpstops but I was balling on a budget and shocktober was buy 4 they reimburse the 4th price and rock auto t4r discount code. they are stiffer than my Monos but are awesome in the dirt(i spend about 95% city/freeway). my monos were busted when i bought the truck so my experience is pretty weak :moping:
Moneroe makes stock replacements as well as a few other lesser known names.
In My Opinion:
I would look into the KYB monomax, solid shock if you're on a budget. Also Adjustables are the way to go in my opinion if you want to spend a little extra also BUT at that point you're spending around 90$ a shock, billies can be found cheaper than this too, and OME's are about $400 for the set. If the price tag does not matter so much i would get the Emus
use the search to browse a little deeper, there are some really good threads with people reviewing most of the suspension setups