I don't know what other modifications you already have and what you're planning to do later, but I'm another 'one' who believes that a single exhaust with good components works better for these trucks...unless you're pushing a lot of HP/TQ.

I think the duals are the coolest looking and true duals are definitely the way to go for the trucks that a lot of guys on here drive but, so far at least, the single 3" that I have works really well and I don't expect to change it.

As far as the mufflers, I think you'll be happy with either the Hooker or the Magnaflow.