Bessey GZ-2K all-steel screw clamp with plastic handle 120mm (4.7"), 160mm (6.3"), 200mm (8")
Low bulk, thin noses, and put on quite a lot of force. Quite a useful spread of sizes for my needs. They do quite a few variants (e.g. with T bar instead of screwdriver handle, cast iron variant, wooden handles), sizes, and accessories. I was half thinking to get the T bar style, but figured it'd probably get in the way more often than I'd feel the benefit for tightening. Might have been nice to have a 1/4" square drive on the end of the handles.