I have had a 7.3 with a side pipe, 6.0 with regular exiting exhaust, and a single miter cut stack. From my experience:
1. Side pipes are just badass, especially on diesels. You will get some cab noise, but honestly, on my 7.3, exhaust note wasnt the problem, it was ENGINE NOISE!!! (i know were all 6.0 boys, just sharing) As an added bonus, with a side pipe, you can roal coal on just about anything that makes you angry
2. Single stacks are probably my favorite. It is what i run on my truck, and theres just something about that "racy, peppy, god damn this things badass" vibe that it puts off, wouldnt trade it for anything. The look you get from a single stack is just uncanny, it says "hey, ill leave you in the dust, and pull you home when you break down". On a down side, the cab noise, especially in a single cab, will be alot. Not so much while cruising, but at WOT, especially if you have a sliding rear window and it happens to be open, HOLD YOUR EARS!!!
3. Dual aussies, i think on a reg cab such as yours they will look to big. Maybe not, but i think you need a dually and at least an extended cab to pull them off. Just my opinion.
I hope this helps a little, and by the way my vote is for the single miter cut!!!!!