Do you feel more comfortable throwing hammer/ebonite? If you do and you think you'd be more familiar with the reactions I'd go with hammer/ebonite.
Heavy oil - Pivot (no question)
Med-Heavy - Arson, First Blood, Challenge, Champion
Med - Source, Legacy, Arson, Arson Hybrid
Med-light - Arson Low Flare, Cyclone, Source
Light-spare - Arson Low Flare, True Blood, Taboo Spare