If you are just looking for the sound aspect, it doesn't really matter. The UELs will all sound close to the same. The money comes in if you are seeking build quality or higher performance margins.
My loyalty is with Tomei, but any reputable header make will do swell as well.
I would recommend you think more closely about the complete exhaust system. The catback exhaust (as well as perhaps the front pipe if you are expecting on changing that) will be important in the sound you are seeking as well