The concept of a washer/dryer is still new to me - in Australia we have separate dryers that get mounted to the wall or sit on top of the washer, either in the bathroom if you're in a flat, or in the laundry (utility room). And the brands are all different here (except for Hoover). The only things I can recommend is look for energy and water efficiency, a stainless steel drum and a removable lint filter :-)

We were hoping to get one of the Zanussi compact dishwashers (the ones that sit on the bench), but our kitchen's too small even for one of those :-/