Cyphertext was trying to help. It is hard to steer you towards the right model S&W AR if we do not know what you want feature wise.
Some people like carbine length direct impingement gas systems, some like mid length and others like rifle length.
Some want a barrel that has 1:8 twist with 5R rifling and others don't care about the twist or rifling.
Some want a carry handle, others want a flat top.
Some want all Magpul furniture, others don't care one way or another.
I would suggest doing some reading on AR's and find out what exactly you want on it. There are tons of different features that you can get. If you want just a economically priced, reliable AR that goes boom every time you pull the trigger, get the M&P 15 Sport. Tons of people have them and love them. If you have a specific purpose for the AR like shooting 3 gun matches, then look at one that will be better suited for that. My first "real" AR (I don't count my S&W 15-22 as a real AR) was the S&W VTAC II. I had a list of wants and it fulfilled the list the best.
So I think you might need to do some research and figure out what you want from an AR. We then will be able to better help you.