Seriously, listen to the different exhausts in person if you can. Everyone will have their own opinion and preferences, asking people that already have a particular brand will usually have them referring their current set up. Being impartial goes out the window.
Choose the sound that you like and set a budget. If you like one and short a few hundred bucks, save up or you'll always think, "if only I spent a few more bucks". Good luck and go with what sound/exhaust that gets your blood pumped.