In my opinion, you can build a much better rifle for $1500. Check out BCM (www.bravocompanyusa.com
). Their quaility is second to none. For example, each and every bolt carrier group then send out is MP tested. When you get a new on in the mail, you can see the brass on the bolt face and smell the gun power in the package. RR is not known for their quality testing and I believe they had issues in the past with carrier gas key staking and bolt cracking.
Make sure the barrel is free floating. I've seen plenty of examples during matches where this has proven to be very important.
If you're just looking for a weekend plinker, Palmetto State Armory or the used classifieds at ar15.com would be a good route. I do a lot of rifle building for 3 gun competitors and for the plinkers. I've built many for around the $600 range that would match a RR any day of the week. There are several tricks of the trade when building an AR that can have a tremendous effect on accuracy and reliability, specifically around barrel installation and gas tube alignment. There are several books out there that go over this in great detail.
I hope this helps.