Tormod's Bellows is what I use. Before that I had a good roll on an Ash Factory (from when they were rerollabe). But basically I'm going for high blast radius, high velocity, grenades & horseshoes (still solid even though it's been nerfed twice), and either tripod or clown cartridge (my ash factory had clown but with the heavy ammo nerfs it's not as good- I used to be able to get 5 rockets with lucky clown breaks, but recently that wasn't happening so I switched to Tormod's Bellows). edit: Oh crap- sorry, you said PvE (didn't notice until I wondered why someone was recommending tracking). When I can't use Ghorn I use a Chloeric Dragon- I have one with cluster bombs (always good for Rasputin strike), a couple with tracking.

anything with tripod and tracking.