A lot of members are going with the magnaflow - and they seem to like them, so that can not be a bad choice.
A couple of us have Supertrapp's. They sound great too, plus they are one of the few mufflers that allow you to tune them depending on your vehicles performance. The one I bought ran me just over a $100.
i have a cheapo ebay muffler. straight through with DTM tips. i have not heard many elantra with mufflers but everyone i have heard sounds like a bumble bee or a fart can. mine is a low growl. and mine looks pretty good. if it goes bad i'll drop another 50$ and get a new one.
Ah, I was looking at the magnaflow's, but I kinda want something more like the usual "can" shape, instead of the dual ends and such, but I dunno. I might go with a dual end, since my car seriously stands out as one of kind in this town, which is mostly neon's and civic's. Thanks for the input though!