For DQ purposes, it's hard to beat 5 DQs at 10 Jet Blue points each at Points for Surveys.
I do like Club Opinions for return rate since I actually like Accor's Ibis/Novotel sorts of properties and I've got a European trip planned next year where I can use the vouchers.
I wish it was 5 completed surveys for each SSI program per day instead of five completions across all their programs because I'd like to do a Jet Blue/Accor/United rotation with them.
But overall, e-Rewards is, IMO, one of the better options for my needs- can typically get three surveys a day from them and the return can be good if you know how to pick the 'right' program redemptions.
For cash/paypal, I like Prize Rebel- do pretty well with the 'Your Surveys' when husband inssits on watching Something Awful on the tv.