After looking at all the pop-ups in the sub-$8000 range at the Expo, I think my favorites were in this order:
1: OVRLND's bare bones cab over full-length poptop. It's basically a lighter, more utilitarian FWC. You can still use it as an everyday truck shell. He's a neighbor, so I'm biased, but not so biased that I can't overlook the pricing - it's a bit much. I may work with him on that topic...but in terms of overall design a full-length pop-up is the only option that turns a truck shell into what feels like a camper.
2: TREEHOUSE - Semi-Custom and willing to make the cabover longer, the shell higher, change the door styles, all that. Great pricing for Semi-Custom. If someone stole $7k from me and dropped a camper off at my house, I would want it to be this one.
3: A TIE - Summit and Vagabond - both committed to taking full advantage of the cab-over length. We'll see if the Summit is under $8k though. The guys from Vagabond are super open to crowd-building the full-size version, so it may come with some definitive improvements - ie more side entry doors, longer cab over, etc.
4: GFC - I was stoked on their initial offering, being cheaper than the rest, but I can't get on with the lack of length and cabover. It sucks having to move panels out of the way in order to get out of the camper. Seriously, if you and your bed partner are sleeping up there, you'd better hope they are ready to get up when you are because otherwise you're trapped.
I still think a full-size adaptation of Tyler Thompson's Hardside Tacoma Pop-Up would be my favorite, though.
I've got a few pictures to post one of these days...