Can't believe this has made it to the second page without a response! [:)]
RRA vs Bushmaster. Never owned a bushmaster and my current AR15 is a RRA/DPMS (upper/lower respectively), but if I had gone with a complete rifle it would have been the RRA. Slightly less expensive and I like their offering better than Bushmaster. Personal preference of course. I'm pretty sure you will get the general answer that you can't go wrong with either manufacturer. These guys both put out great products and both have a dedicated following. Pick wichever has a rifle closer to the exact configuration you want and fits your price range.
Oh yeah, if you want to save a few bucks, check out the EE and consider buying the upper and lower sperately, you should save a few bucks. On the other hand, if you want an already tricked out M4 check out [url]www.onpointfirearms.com[/url] RRA or Busmaster M4 with Aimpoint and mounts, Arms40 BUIS, CQB 3 point sling, 10 rd and 30 rd mag, all for $1275. They also have great prices on the rifle by itself. Definately check them out.
Good luck!