Kotobukiya's Gurren Lagann kits are easy to build, and pretty much the only way you are going to get a King Kittan or Dayakkaiser. They even make a Gurren kit, which is pretty sweet. The kits are easy to build, poseable, and just plain fun. Although, they could use a little paint and detailing to make them REALLY sweet.
Also upcoming is a Gurren Lagann Yoko Ani*Statue..