I'm a big believer in fitting the "next size up" board to alllow for expansion.
Case in point: with the low cost of split system airconditioners, it is quite easy to fill up a board with just one service call which then fils any spare poles in the board, some houses I have worked on have ended up with a sub-board being fitted just for split aircons & 15 amp welder/caravan outlets while the hot water service, cooking appliances, power & light circuits fill the original boards.
