I would advise spending some quality time researching on some of the many AR specific web sites.
Right now prices are panic inflated, but in spite of the massive push by the socialists to inflict their wet dream gun control agenda, I think that most politicians are savvy enough to know that it is political suicide.
I have (HAD before the boating accident) Bushmaster AR and love it. I got the model with no sights and added a red-dot on top and new picatiny foregrip. Love it.
Right now AR prices are lower than they have ever been.
Clickie here: http://www.budsgunshop.com/catalog/index.php/cPath/36_1989/page/1/sort/6a