I have done a pile of research and have had a lot of help from others. Choosing steels that etch differently is the key to a good contrast. I also try to use steels that are close in Heat Treat properties and forging temps. All of this is already known. 1095 and 15N20 have similar growth rates, forging temps and HT properties. So In short I have had great success with these steels, therefore I don't stray too far with my pattern welds.
Thanks a lot for the positive feedback.....and Oh... most of what was asked above can be answered by reading through knife lessons right here on IFI.