To Straight pipe or not?

I know there's alot of mixed feelings on this topic, but I need to get some opinions from some people who have a little more experience on exhausts.Here's my setup so far.

Car:69 roadrunner
Engine:440 mag
Headers:none yet probably gonna go with 3" collector flowtechs
Exhaust system:http://www.flowmastermufflers.com/sh...le=&orig=17382
Flowmaster delta force

Most of my friends said I should go with straight pipes. The flowmasters already say "aggressive sound" but I want it to be as loud as possible but not so loud that I can't hear somebody in the passenger seat, if that makes sense lol. I could always just leave the mufflers off and switch in the pipe to replace it then put the mufflers back later on if I decided. What would you guys recommend, straights or no?
Author: Nightmare