I considered Borla but pretty much everyone said it was just a more expensive Magnaflow with little to no sound difference. Can't say from experience because the only Borla I have ever heard, that I knew was Borla at least, was a stock Ram Daytona.
As far as Magnaflow, my dual in/dual out 14" sounds really good and not crazy loud under heavy throttle. It drones more than my GMC with Magnaflows did but WAY less than my Chevy with Flowmasters, both were 05-06's so it made for as good comparison. Back on topic, I have JBA shorty headers so I'm sure that adds some loud factor to my exhaust.
Another alternative is just run your stock exhaust and get your resonators cut out. I ran my truck like that for a while and it was just enough to make an aggressive note that you really notice it outside but it is stock noise level inside.