I think a lot voice down to personal preference, a black water setup in my opinion, suits a purely DW scape. Combined with a few well position rocks, it resembles a amazon-liked biotope setup. I too encountered problems while choosing DWs, ended up getting 2 different colored pieces that didn't appeal to me. But I realised slowly, many a times the hard scape may seem not that pleasing to the eyes, it'll surprisingly change for the better with some greenery on them. I don't have experience doing a pure DW scape, but your 1st and 4th scape look pretty good to me!
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