Right, here's my entry.
This house was built on no particular style or theme, just my hopeful attempt at something that's functional and not butt-ugly. In my tests it housed eight Sims pretty comfortably, and could probably squeeze a few more in with a bit of modification. Built on a 3 x 3 lot, priced at $76,438, fully furnished; Career and Aspiration rewards and vehicles not included, but there should be adequate space for them. Load time at full occupancy was moderate on my computer, which is middle-of-the-road in terms of specs.
ETA: This house was built with Uni, NL, and OFB installed, and may crash non-EP and/or unpatched games!
Exterior front right:
Exterior front left:
The painted pattern under the roof is just there to make that space look less empty, since there are no Maxis windows that would go there. :/
Exterior back:
Two views of the ground floor interior:
Upstairs interior:
The walk-in closets are a favorite feature of mine; I put hacked clothing racks in them and use them as actual closets, but you could also use them to stow smaller rewards not currently in use, or rip them out to expand the bedrooms.
Basement/Garage:
I failed to realize until after the house was packaged that a visitor could gain access to the restricted parts of the house via the garage; however, it should be easy to add a lockable door in the basement to prevent this. (No visitors tried it while I was testing the house.)
My bribe for both distinguished judges is attached separately, pictures included. Yours to keep and enjoy regardless of the contest's outcome, and I can easily add to the set if requested.
Edit: Because Photobucket seems to have resized my screen shots without permission, I'm attaching a .rar with the full-size shots.