First off, BUY ON SALE.
The Scythe: Unfortunately overshadowed by the Claymore Sword
Tommy Gun: Cheaper but less magazine size than Dr. T's Delivery System (Found in the Community Weapon Pack 2)
Flare Revolver: Akimbo is possible, good damage, spammable, possibly the best Firebug weapon
Buzzsaw Bow: High price, high damage, only ranged Berserker weapon, buzzsaws can be recovered