IMO, I think you should take a look at bounties are being managed by good bounty manager like Amazix team, Yahoo or deadley. Almost bounty campaigns managed by these managers are really great. For now, you can take a look at YUMERIUM which is being managed by Amazix 
Thanks for your detailed explanation. Am looking to key in ASAP but how do I get their full site to join as I couldn't come up with it on Google. I mean it shows me different sites and am confused. Thanks