If by "single tip, both sides" you mean duals, I'd go with that. I don't like the straight out the back duals. To me they are too common and look like you just slapped them in the truck without much thought. Either 90 deg. or 45 deg. in front or behind the tire would look really good on your truck.
Oh, and if you don't plan on keeping this truck for all eternity, stay away from stainless. You'll spend less than half if you use aluminized steel.
What mufflers are you going with?
I like your gray a lot more than that blue on the other truck.