It's my pleasure to help you fine members out. You don't need a lot of money to accessorize your AR-15. I can see if you're going into combat or shooting professionally, yes, you would want SOME high $$$ parts. Most people that add name brand parts to their AR's are just doing it to make others think they have money and/or to just show off.
I just recently bought an AR STONER trigger group. I then bought a JP ENTERPRISE 3.5 lb. spring kit. The spring kit combined with the trigger resulted in a 4.75-5 lb. smooth as silk, breaking like a glass rod, trigger! Total cost? $39.95 with FREE S&H on both parts/kits! My shooting buddies tell me it's just as good or better than an ALG & BCM PNT trigger.
Just PM me if you want to save more money.