I'll throw in Michael Sprott. Fought some well known fighters over the years, Chagaev, Joshua, Takam, Dimitrenko, Teper, Pulev, Ustinov, Lamon Brewster, Helenius, Audley Harrison, Danny Williams, Matt Skelton and a few others.
I wouls say Tua, but he's been more of a contender than journeyman most of his career. Would have to say either Del Boy, Mansour, Cunningham and Tarver at HW.
You have to like a guy who sues ESPN from prison for appropriating his likeness for showing one of his fights.