Bushmaster is a great brand, and definitely one of the best out there. Generally, in my opinion (shared by many), the best brands appear to be Bushmaster, Colt and Armalite, as well as some of the smaller companies like RRA, CMMG and some others. DPMS are fine, and make good rifles, (and I don't knwo of anything wrong with them) but often are not listed among the "top" players.
If you don't mind some advice, I'd definitely spend some time shooting (and getting to know) the AR BEFORE you stick all kinds of cool accessories on it. If you're not getting a detatchable carry handle, I'd get some back-up iron sights (BUIS) - which you'll want to get anyway, to back up your EOTech. Spend some time shooting the rifle with iron sights, and the stock configuration. Then, once you can shoot well with it, start adding all the cool stuff, like lasers, optics, etc.
Just an idea.