Just curious, Catrin, since it seems like your new Gunnar is an incredibly versatile bike (can take wide tires to function more like a rigid mountain bike or narrower for more of a road bike ride), have you considered selling your LHT? That would free up a good chunk of cash for a second "go fast" wheelset for your Gunnar, and you'd have the advantage of a much lighter bike no matter where you planned to ride.

You've probably stated why you're keeping your LHT as well; I just know that in the past when I've upgraded to a new bike that was a similar style, the old one ended up languishing until I wised up and sold it -- that has happened to me with both road and mountain bikes.