Gundam, eh? Then definitly check into Macross/Robotech. I'd alo recemend two non-animes Exo-Squad and Battletech they are great mecha toons.
Hmmm never did much samuraii besides what you've seen. I will exit by making a recemnedation that you see Excel Saga, it has a fun little Gundam parody towards the end of the series and well, is incredibly funny all the way through.