IMO I think that the amount of money should be based on the amount of use and what you're wanting to use it for. There is a lot of parts that you can spend a lot of money on and not really see or feel. A lot of people make them as light as possible which is fine but if you're not going to be holding it up for long periods spend the money on other things. Trigger is where you will feel the biggest bang for your bucks. I'm not a big fan of quad rails. I think they are uncomfortable and I don't like my riffle to look like the add for tactical'R'us. Pistols are uncomfortable to shoot and hold because you can't shoulder them. and once you get below a 9'' barrel I would just buy a pistol. Again this is my opinion. do a little research and make it for you, and realize that it is hard to sell a AR for what you put into it.