Room design drawing package wanted

[Foster]

I'm looking for an easy to use room design package. While I could use Solidworks to layout the new robot/electronics space, the designer of the rest of the house could use something simpler.

-- needs to have basic shapes
-- bonus would be to have predefined tables, chairs, etc.
-- ability to click on a wall or window and enter the length.
-- be able to put stairs in drawing
-- 2D is fine (its a 4 level split level, 3D just adds to the complications)
-- Local install vs web is preferred
-- Need to be able to save multiple versions (ie, empty room, design 1, design 2, etc). Most of the online versions choke at this.

Thanks!