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 MOC 8958 - Granite Grinder MOD by KBD Design | Rebrickable - Build with LEGO
LEGO 8958 Power Miners Granite Grinder - Entertainment Earth
LEGO 8958 Granite Grinder POWER MINERS - Crossdock
Power Miners Thunder Driller Set LEGO 8960 - Walmart.com
Lego Power Miners 8958 Granite Grinder Sealed Brand NEW 673419112789 | eBay