From what I've heard Banks makes the best system but it hurts the pocket pretty badly. I personally have a Magnaflow cat back system and love the rumble that it gives. Plenty of sound but not an annoying sound. Not bad for the money, although not really the cheapest either.

 

i got this one and installed myself. sounds and looks good.
eBay Motors: Ford F150 04-09 Cat Back Saleen Edelbrock *NEW* Exhaust (item 230323133756 end time Feb-06-09 14:35:55 PST)

 

If you go to a local exhaust shop, they can probably install a cat back exhaust with any muffler you want for way less than you can order a kit. But I do recomend Magnaflow.

 

I was like you, looked everywhere and listened to everything before I decided to go with the Roush offroad duals out the back system...results=absolutely love it. Didn't want too loud because of neighbors and family passengers, no droning on trips, but still love the low growl and wide open power sound...The Roush offroad hit 100% in all catagories plus it is made from 304 stainless which will not rust like 409 stainless (magnaflow)...its a small difference since the 409 only looks rusty, but 304 stainless looks nice when you see the truck from an angle on the street or are under it. Got it on ebay from seller named Morshall for $475...

 

Yup! I absolutely Luv my ROUSH straight out the back duals! Awesome tips too! The T-304 stainless is top quality & has not rusted in over two winters as of yet!

 

Can you keep the spare tire with the Roush back duals? If so how far away are they from the spare?

 

I have my stock spare tire that has not been moved, plenty of room!.....