Here's a quick guide that may help you decide... It really all depends on the tonal changes you want from your guitar for your style of play.
-Tusq can add a moderate amount of treble, sustain, clarity & volume to your guitar.
-Bone offers everything Tusq provides, but in bigger doses.
-Ebony can add bass and warmth.
-Buffalo Horn sounds almost identical to bone, and is a great choice if you want a dark looking saddle with bone tone.
-Walrus Jawbone offers the fundamental tone of bone but with better overtones & fatter harmonics.
-Mammoth Ivory can add sustain, volume, and a transparent richness to your guitar, with an increase in harmonics & overtones!
-Walrus Ivory provides the greatest increase in volume, sustain & clarity.
I'll add that if it has a USP (Under saddle pick-up) then tusq is a popular choice because it has a more consistent desity. In other words you don't get more sound transfer at different points of the saddle causing some strings to stand out more than others. Hope that helps! -Pix
[b][color=#FF0000]If your brain is part of the process, you're missing it. You should play like a drowning man, struggling to reach shore. If you can trap that feeling, then you have something.
[/color][/b] [b]Peace of mind. That's my piece of mind...[/b]