Yup--I lean toward Open D myself. Makes fretting behind the
slide real easy, because the F# that the third string is tuned to is also the III of what ever chord you happen to be playing, so a minor chord is real easy to voice (and, frankly, Open D just plain sounds good to me).
Or how about this--I've been playing around with this thing, as well:
From dropped D tuning, tune the A-string to G. You then get what's known as G6 tuning, and the cool part is that you are basically in Open G, only with the high E left as an E.
Like this:
Standard is--E,A,D,G,B,e--right?
And Open G is--D,G,D,G,B,d--right?
Try tuning:
Dropped D--D,A,D,G,B,e
to:
G6--D,G,D,G,B,e
I've sort of found you can add more stomp to your swamp just by tweaking one more string than in dropped D. You get to keep your licks from both Open G sliding, and standard tuning, and if you insist upon playing full six strings chords while sliding, just reach 2 frets behind the slide on that high E to make it an additional V of the chord.
Just some thoughts...I've yet to settle on a tuning, and maybe I never will, because so many of them sound so cool in different settings.
