I wouldn't worry about the durability of carbon - it's plenty strong these day. The price tag will getcha though.
I can't say enough good things about my Cross-Check. The versatility is hard to beat. I especially like the tire clearance, as I'm currently running 40c Clement MSO's for gravel riding and I still have plenty of room for mud. It's plenty fast enough on the road, so I wouldn't worry about the weight or whatever.
There are, however, lots of similar options on the market now (not so much when I got my 'check). Check out the All-City Macho Man, for example. The Salsa Vaya is a little more upright and a little more sluggish (due to the geometry), but it's a fine mixed-terrain bike too. I've got a Vaya I really enjoy as well.