RE: Which AR-15
Gun4hire: "Mark $1500 is normal for a AR. The Arma-lite AR-10 is $3000, "
Are you shopping in Canadian dollars or something? :-)
Every base Armalite AR-10 I've seen in these parts (Nebraska) has been in the $1600 range, (the Eagle Arms variants are available at $995) with the flat top match models around $2200-$2300.
As for AR's, a Colt match Target HBAR is $1035 at the local hardware store, with the Bushmaster variants at around $850-ish, or $950 in full camo.