I'm strongly considering an Anthem X2 but I'm not sure what size to get. I currently ride an '04 Stumpjumper Comp Disc Hardtail in a 17 in. I am 5'9" with an inseam of 30-31 in. I like the fit of my current bike. I took a short test ride near the bike shop on an 18 in. Anthem. It felt a little bigger but I felt comfortable on it. I don't know how that will transfer to the trails. I don't think I will get the opportunity to test ride the bike off-road. Any thoughts about what size I would be happiest with?