Gunner, can you build one yourself, yes. Will it be good and reliable, yes.
Has there been a big price drop on AR's, yes. Just about everyone builds them today and they build good and reliable rifles.
The advantage of building one youself, is that you get to pick and choose what parts will go on the rifle (quad rail, free floated or not, type of butt stock, etc, etc.....).
Telling you to purchase one brand or another is not helpfull since most of the parts no matter the brand is made by two or three companies and sold under someone elses name with mninor changes. The only company that makes all their own parts for the whole rifle is Oympic Arms.
Who's good, they all are but it is a long, long list.
Alexander Arms www.alexander
Daniel Defense www.danieldefense.com
Double Star http://star15.com/basic_rifles.html
FNH USA http://www.fnhusa.com
H&K USA http://www.hk-usa.com/civilian_products/civ_rifles.asp
J.P. Enterprises www.jprifles.com
Les Baer www.lesbaer.com
Lewis Machine & Tools www.lewis-machine.net
Olympic Arms www.olyarms.com
Para USA www.paraord.com
Patriot Ordnance www.pof-usa.com
Rock River Arms www.rockriverarms.com
STI International www.stiguns.com
Smith & Wesson www.smith-wesson.com
Stag Arms www.stagarms.com
Wilson Combat www.wilsoncombat.com