S&W M&P?
They are nice rifles. Everyone knows that I'm not an AR "snob" and think that "most" people would be well served by any of them, but S&W's are truly a step up from Bushmaster and Rock River Arms.
So if you have a hot deal in the works- pull the trigger on it. You'll be satisfied.
If it falls through, I do have a suggestion...This will most likely be my next AR:
A CMMG M4gery upper with 14.7" barrel and "permanent" A2 flash hider. This is as short as you can get without getting cozy with the BATFE. It's a 1 in 7 barrel, 4150 steel, chrome lined, "well done" M4 feed ramps, parkerizing under the front sight base, an "F" marked front sight base, MPI, and flattop. Dealers generally price these between $485. and $550.
Lower? Well just about any will work, but CMMG lowers with M4 butt are about $250.- most dealers. Best to buy the upper and lower separately here, big money savings. CMMG offers -many- options beyond what I've mentioned, but to get any additional options you'd be best served by ordering direct from CMMG. (Pricier.)
One heck of a rifle for $800. Rear sight not included. Quality "far beyond" price, and the uppers are a step up from S&W. The next worthwhile step up from CMMG would be a Daniel Defense DD-XV M4gery at $1200. This rifle is also a deal for what you get.
Sorry for the digression, but I'm sure it's at least interesting reading?