I remember playing a map called "Gravity Castle". It'd be cool if you guys could add it to the server, it's a really interesting map.
http://css.gamebanana.com/maps/166166

Another map is Smash Redux, really cool map. It's just like Smash Cannonz but the blocks are randomly thrown away, it's way more fun like that.
http://css.gamebanana.com/maps/86687