upgrading on PTC sites

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I've been thinking of getting a Golden membership on Neobux, until I saw that it was worth $90. As much as I'd like to invest in that site, I really can't shell out $90. Actually, I can only use $10 which I earned from MicroWorkers. I think I can only afford a WordLinx upgrade, but I'm not sure if it's worth it in that site [it always says that there's no more ads for me D:]. I know a lot of people here have moved on from doing PTC sites, but could anyone suggest any site that would be worth investing on?