I use sinking lines a lot. I've had good success with Uniform Sink-type lines. Orvis is clearing out its Density Compensated Wonderlines right now.

I also have an Aquanova full sink line, which seems to work fine as well, and is a bargain. I don't do much casting with these full sink lines (I troll from a float tube), so I agree that the brand matters less than with floating lines.