Nothing wrong with the OEM tires!
Pirelli Scorpian II's just in case you decide to get off on a fire road. I once had a set of Dunlop Roadsmart III's (100% street) on my GSA during a long distance trip of pavement roads and the bike was very smooth and quiet.
This video shows what can go wrong with the Shinko 705. I'm not saying not to run them, just keep an eye on them.Metzler Karoos have one downfall. As you look at the tire all the spaces between the knobs line up perpendicular to the tire. This causes a tendency for the front tire to slide out on a corner in loose gravel. I would recommend a tire that does not have this characteristic such as Anakee 2 or my favorite the Shinko 705. The 705's are a 70pavement-30dirt tire. In my experience they grip and wear well and are quite inexpensive.
I've never seen that on any of the last 10 rear Shinko 705 I ran, but I never got much more than 4K miles out of a rear tire!
There are some blog reviews of the Capra Xs out there, but sadly no english language youtube reviews. I'd love to see a Chaparral Motorsports type video review. You may have seen this one:I've been thinking of trying the Anlas Capra X for something different, not many online reviews so I don't know how good they are, but supposedly they are quieter