Which ptc sites are best to start from scratch?

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I'm very curious as to which ptc sites are best when it comes to earning without having to invest a single penny. I've already signed up with neobux (heard it's the best among the best ptc's) and onbux (a relatively new ptc site that pays like neobux, as stated in some forums I've visited), and I'm still trying to find out which ones to get signed up with. Could someone give me other sites that could earn as much as or more than neobux and onbux without having to invest anything but patience? by the way, I'm new here in myLot and I've heard a lot of very helpful people that could hopefully give the exact answers that I need. cheers =)