To me, the Baritone is the most versatile instrument in the Ukulele family. With some of the others, unnatural tunings are the norm. With the Baritone, a whole lot of things sound good.
I'd place the standard linear G (low 4th DGBE) at the bottom of the list. You can get away with it - obviously - but it's an awfully low range of notes for a body that size. To go down even lower, to an octave below C? ahhhhhh - you can get away with just about anything if you really want to.
When you raise the 4th string on the standard linear G back up an octave, you change the tonal value of the tuning by about 1-2 steps. Now you have a high reentrant G - a range that fits a Baritone to a tee. Bill Mc showed one way to do it. With us, you can use a set of our Heavy Gauge Ukulele strings, and do away with the wound 3rd.
You can do a
low reentrant D tuning - Cuatro style. This gives the lowest overall range of any set-up that doesn't use wound strings - and most of the old ukulele sheet music was written in that key. (We have a Cuatro set for that).
We've formulated a nice set for linear C tuning - Kimosabe was kind enough to mention it. You don't need wound strings there either, and because of the low 4th, the range of that tuning actually fits a Baritone better than a Tenor, where most people now use it. Cowboy Mike just posted some videos using that tuning:
http://www.ukuleleunderground.com/f...10-Two-Videos-from-The-Ukulele-Cowboy-Society...
Finally the Baritone really can sound good with wound strings. What you'll be surprised at, is how much better it will sound if you raise that tuning. A B flat tuning hits another sweet spot. Any of our G650 sets will work for that, but you don't need our strings (even though they're awfully good!). Any normal set of guitar strings will work there (a set with a wound 3rd will be
much nicer).
We've got a bunch of tuning samples here:
http://www.southcoastukes.com/index_files/inters.htm