Yup, I use lots of terrain from Sally 4th. It's easy to put together, durable, and works for lots of different settings. Great stuff! 
What are the other buildings that I have seen in your videos? The ones that look like stucco or adobe? I haven't seen ones like that before. I have only seen the Sarissa Precision, 4Grounds, and Plastcraft buildings in that style. I have looked at some of the Sally 4th items in the past. But it always comes back to my experience with modular stuff like Dwarven Forge that kills it for me. I also am not a fan of the cost of overseas shipping for stuff like this. It always seems that the expense in shipping nearly costs as much as I am planning to spend.
I checked out the Hirst Arts page. While interesting, I am not inclined to spend a lot of time on molding/crafting. My hobby time is limited to say the least and I prefer to spend it playing rather than building items to play.
Most of my current terrain consists of Plastcraft Saga Coloured Desert buildings, a set of resin temple walls, toy cars, Walking Dead plastic scenery kit, Plastcraft Coloured Malifaux items, Dust Tactics Tenement Buildings/Quonset Huts and Dwarven Forge Dungeon/Cavern Tiles (which almost never see use). I did purchase one TT Combat barn and I was impressed with it. I plan to purchase some more of their brownstones and such. They just don't fit in with the north Africa vibe I am looking for right now.
Some of the Scotia Grendel items looked to be of use for excavation sites in the future. Right now I want to try and focus on some buildings. I figure they will be harder to locate than scatter terrain down the line. As mentioned, I can try the local Petsmart to obtain some appropriate scatter terrain.
I do appreciate all the suggestions though. Please keep them coming.