I haven't used any since FI2 started, but I like my Stampede. Admittedly it's not stock, I'm not sure it's worth it unmodified, but that's haft the fun.
Second the Rayven! If it was guns 1-3 it'd compete with the Roughcut, but small+flywheel (one handed!) is great, once you figure out how to not mess up a flywheel.