What are the requirements? Minimal trigger pull, FPS, action, ect.
If anything goes, I'd like to have a BUL M5 with a light rail (since I'm a night person, I'd most likely be working at night and could probably use a lighted sidearm). Since there's not a BUL M5 with an integral rail or an add-on rail available, I'd probably go with the Wilson KZ45 or Para P14 for added capacity over the original single-stack (the para feels too big but I could get used to it. Haven't held a KZ since they were pretty new and under a grand). Trunk gun would be either an AR15 variant (16" with a surefire handguard, collapsable stock, a low-power scope, ambi safety, possibly the norgon mag release) or a pump shotty (w/ surefire forend). Hell, I'll take both.
I live in suburbia, but if I'm going to be working a rural route, I'd probably go with a scoped AR10 or BAR 10 since they're higher powered and simular to the AR15. [Whichever] would be a fixed-stock A3 with the weaver gas block and the RRA extended rail (if it'll fit), and probably a trijicon Acc-U-Point scope.
The trijicon scope is about the only one I've handled recently and I like it. Dont like the price tag though, since I dont have the money... The reasoning behind the RRA rail is that the rifle that had the trijicon on it was an AR15, and the scope has too much eye relief for an AR IMO, especially with my nose to the charging handle, which is probably the same way I'd shoot an AR/BAR10, I dont know how long the upper is on a .308, and the extended rail would allow me to get the scope just right and still provide me with iron sights. Being cross-eye dominate and having to shoot rifles southpaw makes the bushmaster a little more tempting.