I actually use the opposite approach. I use my best guitars for slide, but then I do play slide 99 percent of the time, so ... Slide need not be just on cheap guitars is all I'm saying. I also use a little radius, as I find that by angling the slide (across the neck not along it, if that makes sense), I get even less excess slide noise from the strings I'm not playing. Or I could just learn to mute better I suppose As has been said, there is no right and wrong with slide - just what works for you. All you can do is try everything you hear about and stick with what you enjoy most. Good point regarding the open G and open D chord research if you want to play some non-slide rhythm parts in those tunings. I've said this elsewhere on the forum, but banjo chord and scale books are good for this. The main 4 strings on a banjo in open G and open D are the same as the 4 highest sounding strings on a guitar in those tunings.