I'd honestly look at a stacked washer/dryer, or even a used (with warranty) w/d pair first. Combos make sense when you're working around the constraints of no venting, high utility cost and limited space, in which the trade offs of additional complexity, smaller size and longer run time are acceptable, but it sounds like those aren't issues for your setup.
$1800 for a conventional pair sounds quite spendy to me. Have you checked Cragslist or estate sales? People move all the time (especially those downsizing) and there's an abundance of late model washers and dryers out there for a song.