Bushmaster is a great gun the only thing you will accomplish if you upgrade to say a COLT is you will pay extra $$ for a name.

I have two colts and a bushy I sure can't tell the difference other than price. My bushmaster is FA and has taken ten times the pounding my colts have and it has never given me a problem.

As far as adding accessories get a free float rail system as 7idl said do not add a rail to your existing hand gaurds. I did this on my bushy and it sucks. I personally am probably going to get a LaRue they make some of the best in my opinion.

Come to a shoot and you will get to see and shoot many different configurations. You can then decide what you want to do.