I just built the Crystal Crawler, an official Power Miners combination of the Crystal Sweeper and Claw Digger! It is definitely the best combo set from the first wave of Power Miners,
Crystal Sweeper - LEGO set #8961-1 (Building Sets > Power Miners)
LEGO - Power Miners - Crystal Sweeper #8961 for Sale in Winter Park, FL - OfferUp
LEGO's Crystal Sweeper Carries Power Miners in Style | WIRED