The vehicle rules in Wars of Insurgency are very light if that matters to you. I asked the author here:
link
…if I had missed something. There were no tanks, helis, or vehicle facings in the rules. He extrapolated how you could add such things. Oddly enough the cover variety and rules are very in depth though. Otherwise both an M1A1 and a T55 are the same as an M113 with a recoiless rifle. The game also only allows for one weapon system per vehicle.
Danger Close is just a renaming of Some Corner of a Foreign Field. It's fully infantry focused. Zero vehicle rules. There should be some good AARs floating around for SCFF.
See:
link
I think you may get a more complete game with No End in Sight out of the box. Plus Ivan is always putting out new content. The other two games are built around fast and simple play but lack a level of crunch I was hoping for.
In order of complexity:
Danger Close (SCFF)
Wars of Insurgency
No End in Sight.
Mind you I have only read these rules but they were all quick to ingest. I think Wars of Insurgency will fit the bill for fast play with lots of options. You just have to tinker those options on yourself.