I like the cav arms, but not enough to buy one for myself. I Emailed the owner about putting out a shorter molded stock (Think A2) and I believe he said they were thinking about it.
Bravo Company is selling thier 16" middy right now for $449. The things sell out VERY quickly. They also sell BCG that are mil spec for $130. So for around 600 you get a mil spec upper to bolt on to whatever lower you choose.
I'd probably do a Spikes or a custom engraved Anvil arms. Get a Lower Parts Kit, a rear sight, and a stock set and you're in business. If you don't plan on using an optic, or plan on a Aimpoint style red dot, check out the LaRue battle sight. Otherwise there are several makers of BUIS out there.