My favorite trucks are bump sides and dent sides (I'd give the edge to a bump side) in a regular cab long bed, the way god intended
I really want to build one with a front coil setup and 40-42" tires. I really like
rattle_snake and Harry Wagner's builds, but I think I would rather go with an 7.3L IDI Turbo, DT360, or 6BT (last resort

) and a ZF s6-650 for a transmission.
Rattle_snake's '72 build in case you've been living under a rock
Harry Wagner's '77 truck that was previously mentioned in post #2
I am also partial to '80-'86 trucks since my grandfather had one that had been in the family since new I rode around a lot growing up. I had an '84 F250 6.9L 4x4 for a while that I had big plans for, but after taking stock of my current projects I decided to sell it to my uncle recently

Of course regular cab long bed is the only way to be. I really like Dave Chapelle's "Mom's Spaghetti" build (yes, I know it isn't actually an '80-'86

) Personally I prefer a style/fleet side bed over a step/flare side, but it is still cool none-the-less.
I also really like the '99-'07 Superduty trucks and the original build of the 2002 "Ultimate" Superduty was one of my favorite builds even if it was a bit of a turd
I couldn't find any good pictures of it wheeling, but Duty Calls from the old board had a cool 2000 F350 until he swapped all the parts over to an Excursion.
There was also a really cool '03 Superduty build from Alaska I have never been able to find again. It was probably the cleanest and most functional Ag tire build I have ever seen. I feel like there was a build thread on it on Pirate and it was on the cover or a feature article in Petersen's or Fourwheeler about 10-15 years ago. I really wish I could find it again
I like 1st gen Rangers and Bronco IIs and I think the most inspirational build I have seen was Ruth's from Pirate.
The "Punisher" BII build back in the day was pretty cool too.
'66-'77 Broncos are my favorite 4x4s and there have been plenty of incredible builds out there, but some of the ones that come to my mind first are JR's (even though they were buggies with Bronco skins

) and Gordon Ballie's.
Gordon Balie's that is still mostly Bronco