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,
LEGO 8961 Power Miners Crystal Sweeper | BrickEconomy
LEGO Power Miners: Crystal Sweeper (8961) for sale online | eBay
Crystal-Sweeper-Proto | The second prototype loop of the Pow… | Flickr