You can really get any of the AR's as most are just assemblies of parts made by someone else.

For home defense i would look at one of the short barrelled configurations with a flat top for mounting an Eotech or similar sight but also comes with fixed sights.
For hunting you can simply purchase an upper in something like a 6.8SPC, 450 Bushmaster, 50 Beauwolf (sp), 458 SOCOM, etc...


Or you could go the AR10 rout which is based on the 308 Winchester therefore it is a larger and heavier rifle but will excel in the hunting arena. There are still very good home defense models to choose from with fixed sights and short 16" barrelsand there are a number of frangable 308 rounds that can be used in home defense. Purchase an upper assembly with a longer and heavier barrel in everything from .243 to .300RSAUM and .338 Federal and hunt everything from deer to moose.