There are three rooms that can be added to any house to make it 'dreamy' for me.
Kitchen:
We're talking about 200 square feet in and of itself. Main cooking area needs to have a full Viking or Viking-esque range with hood fan, warming/toasting trays, double broiler, the works. Center island will have a built in griddle with seating for 4 (six if they're all friendly). A breakfast nook with an eastern exposure is a must, waterfront view would be nice but can be substituted with forest/mountain view. A walk in freezer tops it all off nicely.
Master Bathroom:
The main features of the room are an elevated tub that can fit 2-4 people. A quad head shower/sauna off to the side, separate toilet room. The vanity would be in the connecting hallway between the bathroom and the master bedroom, dual sink of course. Towel warmers and other tech would be added as necessary.
Home Theater Room:
Stadium style seating, couches, the works. High lumens projector, HD everything, hookups for all known game consoles. Maybe a media center PC/Mac. All I know is that once complete those sneering f*ckers over at Bang and Olaufson(sp?) would wipe the smirks right off of their faces. By default this room would be soundproofed to prevent keeping the whole house up on 'movie night'.