Location, Size, and Security. We basically could do with no less than 3 dots of size, and location is hard to add to after the fact.
I do remember Morgalahan saying that, should you sell your place, the resources could be, possibly, cashed in for 2 or 3 dots towards this.
3 dots of size would get us a 5-8 room house, which is enough for a room each and amenities. A full on Angel sized hotel would probably be 4 or even 5? We could very easily stretch to a run-down manor or an old Motel/B&B kind of sized hotel, perhaps?
Obviously one with a basement, especially in the short-term, would be good.
Personally, I'd suggest we go for at least 3 or size, and maybe 1 of location (more if we are all buying a Dot AND selling your place), and worry about security in the mid to long term? Someplace with a Garden would be a good idea, if we're adopting a puppy...
For reference, I think M' said that ranks in haven, as a merit, would merely cost 2x new rank, so if we each pitch in a dot, then we've plenty to work with, (though the actual finding, planning, and executing of all of this will need roleplaying, obviously.)