Combination of instance housing and what we have now.

For housing we have now, I would do pricing based on gil floating around, i/e basically setting the prices back to when housing was first released.

Instanced housing would mimic the prices we have now.

adding a 4th size to the wards, 1 per ward, on a 1 week bidding system, starting at 300-500 M (depending on gil per server)

Rules what we have now, 1 fc, 1 personal per account, alts on account get full access to the personal.

Instanced housing all start as what we see as smalls, then players do work to upgrade them, up to the 4th new size. New size would be very hard and tedious to upgrade, meant for a status symbol.