Dual or single exhaust? And what muffler?

I have a 2007 Ford F150 with a Triton v8 engine. Currently it has a single exhaust on it and i'm not sure what muffler or if its stock or not. I am going to be upgrading it soon, and i'm not very educated in the field of mechanics. I want this puppy to be really loud, but nothing illegal or gross sounding. I want that loud, crisp sound of the V8 to really come out when i drive it. Should i go with dual or single exhaust? And what muffler should i go with? Also straight exhaust or turn up by the wheel? What would look best on the truck? Thanks and i will award best answer very quickly.

Here is the truck, since it won't fit on here i put it on Imgur- http://imgur.com/X7R5Uek

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