Indie/expansive/experimental band

I'm looking to form a band that sounds massive and brilliant. I've played in other bands before but never really found my niche. I want to make an expansive sound that fills the room/club/arena/Knebworth with post-rock widescreen music that people can get lost in. Think Mogwai, and Radiohead with a bit of the National and Spiritualized thrown in. I play the piano/keyboard and sing but open to go with whatever. Not looking for mad experience, just a willingness to play, experiment and enjoy.

Cheers, Joe