Saiga rifles are made in the same factory AK 47s and 74s have been made in for decades. They are the really nice Russian AKs everyone wants, but brand new and at a fraction of the cost.
Just make sure that if you do the conversions you make it 922r compliant.
Edit: I really like keltec products, and especially their SU16 rifles, but they are not intended for heavy end of the world type use. Probably decent enough for 99% of homeowners needs though.
The benefit to getting one over a Saiga is that you could have ammo mag interchangability with an AR down the road.