Don't touch the computerised pumps! But the manual RULE is a lovely pump: also look at the Rule-Mate series with integrated float-switches very seriously: they're cheap 'n cheerful. But my favourite, if $$ isn't a problem, is the BS-series switch from Quick (yes, it's a product-punt!) driving a manually-triggered pump. Their only enemy is oily water which coats the contacts- a dry finger or a rag fixes that.