Computer Room Design

My family and I are thinking about moving and designing our own house. Well I need some advice for the best, most detailed Interior and Exterior designing software to buy for under $30?
Detailed as in where I can add different kinds of furniture, add a basement, a media room, and a game room.
Have any suggestions?

Thank You Very Much.
10 points to Best Answer!

hi, im wondering if there is a home designing/room designing software that is available free, thats is simple too use with lots of options.

i ask because my mum wants to decorate the living room but is unsure on how to decorate it

thanks
also it must be compatible with vista home premium 32 bit (but i ask vista so it should work)