I have a Jake, and used to have two, so you know I like them a lot. Actually, my favorite cyclocross bike. It is better suited for trails and singletrack, though I do some road miles on it and it works well. I also have a Surly Crosscheck that I use more for road and it is a little better for strictly road use. I think the Jake is a better off road bike, and the Surly makes a better light trail/road bike, but that is just my opinion. For your type of riding, a Lemond Poprad or Surly may be worth checking into as well.
As far as size, I'm not sure.
The price seems fine, and it is a good value in cyclocross bikes. Just thought I'd throw in some other options as well, although like I said, the Jake is my personal favorite. Great bike.