never announce when you are going to test someone as they may send you premium just for review purposes especially if your username matches your account name there, no referral links, some are in my sig if you want to use them...
clicked text ads are the best and my favorite is...
http://www.traffic-out.com/
traffic-out wont send you a gazillion hits like skimmed can but the quality is very high and I'll take quality over quantity anyday
these 2 work the same if you run a run of the network ad where it shows across their network or you can buy individually from sites in their directory you like, I run across the whole network at blacklabelads and then just delete the sites sending clicks I don't like which takes a little work but good to trim it down to the most productive sites or better matching sites to your niche as no sense getting hits from gay sites if you don't sell gay etc...
http://www.juicyads.com/
http://www.blacklabelads.com/
I haven't used this one since 2003 or 2004 but it was good then and I don't hear complaints about it, he has those instant messenger pop-ups that can work for cam sites, I'll give him a run soon but I doubt he would still be rocking after all these years if it was garbage
http://www.chokertraffic.com/
there are a few others I have messed with but I don't think I have a strong enough opinion one way or the other to comment yet, testing traffic-out versus traffic holder isn't really a fair test as traffic-out is clicked text links where traffic holder is supposedly skimmed so you would need to test traffic holder against another skim provider, honestly I can't see throwing money at traffic holder unless you work there and in a week you intend to post that it beat a clicked text link provider which is impossible, just pay me the $50 and I'll quote another 50 people that use bot and traffic holder in the same paragraph, good luck in your testing.