It would have to be Heavy Lifters from Aliens, or the Armored Combat Suit from C&C Tiberean Sun.
From an Anime aspect... Construction mechs from PatLabor.
Almost there mechas.... Valkyries from Macross, Mechs from Gasaraki or even from Full Metal Panic.
For the ridiculous... mechs from GoNagai (Getter Robo, Mazinger, etc.), mecha designs from Kenichi Sonada (Maddox, Knight Saber Suits, or Canon God Exaxxion, etc.), GunBuster or Dangaioh.