If I get a passive sub (with no amplifier), can I drive it with one of the 65w channels on the 1050, or will that not work?

Or, should I just get a powered sub? I'm considering HSU and SVS subs right now. Any recommendations?

On a side note, how important is it to 'match' the subs to the speakers? I have b&w speakers but b&w subs suck, so I need to get some other brand.