I run a Slik SVH-501 fluid head. They can be had really easily for right at $100. It's never been overwhelmed by an 85mm spotter, is small enough that it doesn't take up a huge amount of real estate on the tripod or add a bunch of weight, and it has individual adjustments for pan and tilt, so I can lock my tilt in and just slightly loosen my pan and really work a hillside. And, it's really lightweight. I highly recommend it! Here's a link to it so you can see it, I'm sure you can find a Rokslide sponsor who can get you hooked up!