What's a good DD or SD system?

I'm a high-low player because there are only shoe games near me. I will go to Vegas regularly for the next few years (I suppose). Here's my question:

Since I already know high-low, should I bother learning another system for SD or DD games?

Would I be better off learning something like the KO?

I have no problem keeping a side-count--should I go with a hi-opt?