Bullitsam the answer is stay away from both. While the SU is cheap, its well, cheap. The SIG while nice, if i went that way would probably go with a S&W M&P15. The Sport is downright inexpensive but Im not sure about the melonite vs stainless issue. Good info from posters here and over time I will settle on where to put down my cash as I am in no rush. I'm back to 5.56 vs 7.62x39. In the meantime I did pick up a 1942 Mosin for $89, cleaned up the Cosmo and fired a couple rounds so that will tide me over for a bit. When it stops raining I'll get it out and shoot some more. My first bolt gun so it was fun pulling it apart and putting it back together.