My favourite shoe for clips were always the Adidas Stan Smith tennis shoe which has been reintroduced after first being sold back in '77... they run $60.00 - 160.00 but considering they will last forever they're not a bad deal. They also come in black which hides scuffs really well.
My new shoes are also making me pretty happy... I scored some nice leather Uvex shoes with a toe cap which makes them perfect for those days I am using clips. They are rugged and very breathable although not the kind of shoe I would want to stand in all day.