I have a '98 RT/10, too, and had the same question a year ago. After some research I ended up getting a Corsa 3" catback System accompanied by some high flow cats (Magnaflow in my case). Main reason for the Corsa was due to being the only system with no drone. Plus, I like(d) the tips by far more compared to other systems. After more than a year I am still very happy with it and would do it again, no doubts.
But one thing I should mention regarding your comment on sounding like an American muscle car. If you have the sound of a '70's big block V8 in mind I have to tell you that this will going to happen with any of the exhaust modifications. The Viper will always sound differently due to the fact, that it is a V10 and uses an injection system instead of a carburetor.