All TIM's these days perform within a few degree's of each other. I personally use the Arctic Cooling MX-2 since I got the 30g tube. You may want to look into ArcticSilver 5 since it's one of the most reliable TIM's since its creation from way back when. You can look into the Cryorig C1 if you're looking into top down coolers while a Be Quiet Dark Rock Pro 3 can be a good tower style cooler. The choices are endless and the only limitations would be your budget and your cases CPU clearance.