I'm wanting to put together an Intex pool for the summer. I've got a 5-year old so I don't want one of the biggies but I'd like to buy the filtration system sufficient to handle an upgrade to a more substantial pool in a year or two (From previous experience I know the supplied pumps with these pools are wholly inadequate). So my thought was to get the :

Intex 56673EG Sand Filter Pump (1600 GPH)
Intex 54601EG Krystal Clear Saltwater System (which includes the adapters to a smaller Intex pool apparently)
Intex 12x36 Easy Set Pool

Does this approach make sense?
What other accessories should I buy at the outset to be ready to go