Don't let my lack of familiarity with the less common brands dissuade you from them. Try as many different makes and models as you can find in your search for the best fit. One final note, the dollar amounts mentioned with some models may not be accurate. They are intended to give only a relative idea of prices and don't necessarily reflect what you'll find in stores or catalogs. The R-13 is what I have been playing since the first day I held a clarinet in my hands.
Buffets are famous for their full, dark, resonant tones.
I have yet to hear another clarinet whose characteristic sound I liked more. Along with its famous tone, the R-13 suffers from uneven pitch. When shopping for an R-13, always test these intervals with a tuner. Some instruments are worse than others. In my experience, shopping for an R-13 is like trying to find a good reed in a box of ten.