If you want Autocad but can't afford it try Autocad LT. You don't get the high end features like true 3-D, but for plan views its fine. You can also get a free demo disk of Actrix? ( I will repost later). This uses a drag and drop like Visio. 3-D from Broderbund works also. It has some quirks when you try to move some items so you end up deleting them and adding new ones where you want them.
