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Looksmart is another I have had pretty good luck with. They have receintly aquired a very smaller name engines that power a pretty decent amount of traffic, with very little conpetition. I started with the inclusion part of Looksmart, but after having a fairly low ROI, I decided to drop that and move on to their keyword campaign.
I am also running an Adwords campaign that is ok, I guess. About 2 months ago I was about to drop the campaign, due to the high cost and very low conversion rate. But a couple of weeks ago there seemed to be a drastic raise in my conversions, granted you are not doing the braod targeting.
The others you listed, I do not have that much experience with. I just figured I would give you what I know. I hope this helped.