mufflers or no mufflers??

i dont think i would ever go with magnaflows....almost every guy with a v8 around me runs magnaflows and they sound like ****...i would go either flowmaster or dynomax...my friend tells me to go borla xr-1, but i think thats a race muffler lol....if i have to sacrifice 3-5 horsepower for a good sound i dont mind, but anything more than that and im concerned