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Unless you are targeting very competitive keywords, you have to weigh the amount of time that you are spending setting up accounts on smaller ppcs with the amount of clicks that you will get from people in your target market.
I find goClick doesn't deliver very many clicks but John the guy who runs it seems to have some integrity.
I am also currently using roar/pageseeker which can be ok if you are in their particular areas they cover. However, I will not be renewing do to excessive email spam.
I have also used at various points in the past kanoodle, ah-ha, epilot, and sprinks but would not recommend.