Personally, I don't think MONTEREY WHITE works very well with CLOUD WHITE. Are you locked into CLOUD WHITE? There are much better whites that work with today's colours.

Is it really necessary to paint before you choose your furniture? It would be so much wiser to make all your selections and THEN choose a paint that works with those. To paint first is really a backwards way of decorating that won't give you as nice a result.

I am wondering why you want grey/beige as a paint colour to go with black/white! Grey and beige are both dirtier versions of the floor colours! Far better to bring a nice light tone of your accent colour from your new living room out into the hallway. For instance if you have a greenish gold accent elsewhere you might have Benjamin Moore LIGHT KHAKI 2148-40 which would set off your floors beautifully.

As for recommending a front door colour, we really need to see what the house looks like and what materials it's made out of and what style of door you have.