I'm looking to invest in a slow cooker but I have a tiny kitchen so want one without a huge footprint. Is a 3.5 L one enough? We are currently 2 adults, a pre-schooler and a baby on the way so thinking ahead it should be big enough to feed us and the children when they get a bit older too. I don't usually batch cook so I don't need leftovers to freeze. Any recommendations for a good one which is not too big?