I am currently running a custom straight pipe back to an ebay fart can muffler. I don't have any bending or welding skills so i had some buddies at a muffler shop hook me up. They were all laughing at the muffler when I left, but when i came back to pick it up they were mouth-wide eyes-open. They were thoroughly impressed by it. I have a full 2 1/2 inch pipe, no resonator, and a ebay $30 glass pack can muffler on the end and it has no rasp at all. Sounds awesome. If you want I can post a video, been looking for an excuse to rev it up.
Also, as for the 3 inch exhaust, it really isn't necessary unless you plan on swapping turbo, but I know a lot of people like the sound. If I were you, I would go 2 1/2, but that's my opinion.