I am a relative "newbie" at string selecting. I have experienced playing ernie ball hybrid slinkies (well, i think it was a hybrid, neways) and ghs bass boomers. Are these steel or nickel? I like the feel of them, but for my next set, I want to try out Rotosounds, the roundwounds, in either steel or nickel. I recall some of you saying that stainless steels feel kind of "sticky," but I suppose that doesn't apply to standard steels. Is it worth getting nickels? I do like playing slap bass (which nickel is commonly used for) but I also am in my school's jazz band, thus needing mellower tones at time (which can be a chore with my Spector's active electronics). I want to hear your opinions and/or comments and/or suggestions.