Depending on your budget, id gor for the 01-03 style. they are most favored by everyone. If you can swing it, get a 2002-2003 FX4 Level II. like this one local to me:
They are fully loaded w/ 31x10.50 BFG A/T KOs. 15x7 Alcoa Forge Aluminum Wheels, Bilstein Shocks, 4.10 Limited Slip Torsen rear diff, special black interior, stainless shiny front tow hooks, . If you get a manual, they came with special NICE twin stick setups (manual transfer case). I should have gotten one, but didnt!! If you dont get one of these, at least get the regular FX4 package with the limited slip.
to find them in your area, just fo to Autorader and fill out the form. under years, put 01-03. under modify keywords, put fx4 and look through the list for similar Rangers. you can find them by the signature Alcoa Wheels w/ 8 holes