Hmm, I use popads and the ecpm is usually around $0.80 - $1.40
Not sure if It's worth it though, but I feel they're decent and they have a low minimum payout at $5 the last time I checked. I get around 60% of my total pageviews as impression on popads, but there's also a reason for it. I only set up popups to appear on visitors which aren't logged in my site, and everytime there's no available popads advert, I have the alternative popup always being counted.
I am currently trying edomz since days ago, many said that they pay good for Asian traffic, which is a lot on my SE Asian audience.