Great thread, guys; keep the advice coming!
For my 2 cents, one of the biggest things to watch for with blowers/throwers is gravel driveways. I've heard one too many horror stories about a thrower/blower busting a window out when cleaning a gravel driveway.
Other than that, I've got both on tap for this winter. I'm hoping to use the QA42A/682 combo for my sidewalks at work as I've got quite a few that need cleaned and this will (hopefully) be easier than walking behind a snow blower all winter like I did last year.

I want to keep the blade and 1050 or 129 at home for my gravel driveway but if we get the house we're trying to get, all that may change.