AdMob.com
Trusted Ads Company with millions publisher. PayOut every 2 (two) month since You earned $20.
Minimum Payout : $20
Payout Alternative : Paypal and chek.

BuzzCity.net
Minimum Payout are $200, Payout every 2 Month.

MobPartner.com
Minimum Payout are $20, with moneybooker, bank transfer and paypal.