What is a good muffler to get?

I am new to the whole performance muffler part of cars and i have no idea what to buy! :( can anyone help me out?? I want one that has nice performance but is not ridiculously loud that i will get headaches, just something that has a nice little rumble but just a bit more than stock, not those big ass sausage cans LOL

What kind of car is, What kind of Motor, the sound of a v8 greatly differs from that of a 4 cyl. Flowmasters for v8 are always good, and on top of that they have sound bites on their website to test listen. Greddy, Apexi, HKS, Basani, BORLA, would all be good mufflers for a 4 or 6 cyl. stay away from Cherry bombs, as these are GLASS PACKS, and are designed to be even louder with the muffler on than off...