Hi Andrew, do let us know what levelling base you're going after!
By the way, just received my [b]Atomos Samurai Field Recorder [/b]([url=http://atomos.com/samurai]http://atomos.com/samurai[/url]), and it works pretty darn well on my EX1R, just waiting for the HDMI to SDI converters so I can use it with my GH2!