I like Usabilityhub. It's not a fast paying site but they send you small tasks to do from time to time and I have cashed out twice with them. The tests have different values and you need to be quick to get them but if you switch on their notification system you will see them as they come in. The cash out rate is $10 and they are legit, you will definitely get your money,
Another site is Enroll and although I used to get tests from them I haven't had one in a long time, You only need $1 by the end of the month to cash out here. I think my location was a problem here as the tests always came in in the middle of the night and had expired by the morning,
I can definitely recommend Usabilityhub. Their support is good and will answer any questions you might have which is always important with a site.