Since you are just starting with the lighting I'd like to offer the following suggestions.
1. For the LED stick with the warm white - the cool white comes out light blue when you photograph it.
2. Wire the lights for the houses with as many separate circuits as possible and install potentiometers in the lighting circuits. You will want to make sure the pots you get can take the current draw otherwise you will have a lot of interesting smoke coming from your control panel. With pots in the circuits you can adjust the light levels independently. Among the many things this will allow is low light photography (still or motion) of your layout with the street lights looking like streetlights instead of small atomic bombs and your house/factory interior lights looking like interior lights instead of giving the impression that the house/factory is on fire.
