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 Power Miners 8708 Cave Crusher Complete with Manual and Box | eBay
Lego Cave Crusher (8708) for sale online | eBay
LEGO 8708 POWER Miners Cave Crusher Special Edition - New, Sealed! - $250.00 | PicClick