Any with a decent charge rate and impact will work. Spray and Play, Hip Fire, maybe Rifled Barrel for added range, are all perks that fit well on any fusion rifle. I've been using my Telesto more than my Susanoo (the Warlock specific fusion rifle), but the Split Shifter Pro is a good fusion rifle that only drops in the crucible. I haven't used any of the Vendor FRs yet, so I'm not sure how they stack up against the others. The one from the Darkblade strike is beastly though. A buddy of mine has it, and while playing on his account, I wrecked in the Crucible with it :)