The Crane D60 center section is by far the best on the market. It looks to have the same or more clearance than a Pro Rock, is made of 8026 cast alloy for more strength, and will be about the same price as the Rock Crusher. It also has mounts cast into the top of the housing for link suspension mounting points in three places. The also come with a diff cover too. I saw a set of these at Supercrawl and was floored. Definately more quality than any other on the market, not to mention the price is right too. They will for sure be the next set of center sections to go on my comp buggy. Wish I had pics, sorry guys. Ran over the digital camera.
I have no affiliation with Crane, but I do run their knuckles on my comp rig. I had the opportunity to get a free set of the "other" orange high strength knuckles and turned them down to instead pay for the Crane knuckles after comparing the two.