If you want low cost and easy setup, get the Zalman 7000 AlCu. Yup, the AlCu, not the Cu. Sure, the Thermalright may end up better, but you'd have to bolt on through the motherboard (trivial for some, not for others) and you'll have to choose/pay for a fan. Also, choice of fans will impact performance even with same CFM ratings.
The 7000 AlCu is just an easy, quiet choice at $30 that gives very reasonable performance.
Disclaimer: I currently own three Zalman 7000 AlCu, one Thermalright ALX-800 and one Thermalright SLK-900A. Have previously owned Zalman 7000 Cu and Thermalright XP-120, plus various other Zalmans and Thermalrights.