Suggested Reaper Builds
With your armor, you should be running dagger or greatsword. You have power as your primary stat. Work on getting enough hero points as fast as you can.
Reaper, Soul Reaping, and one other (Blood Magic for dagger travel bonus and small heals, Spite for power, or Death Magic for minions or toughness stacking) is your best bet.
Use shouts, Spectral skills, or signets for utility. Reaper supports greatsword and shouts. Soul Reaping supports staff and Spectral skills.