I'm thinking about upgrading my bike Cube Aim 29 2013. Current configuration described here. The bike is completely ok for short rides, but for longer rides doesn't feel comfortable. So I'm going to change saddle and pedals, but I also want to make it more suitable for off-road rides.
I'm considering Shimano components. Is it reasonable to buy something like XT M785 10 Speed Double Groupset? Or SLX level components would be enough?
Regarding the frame - it is in good condition and Cube uses the same frame for their higher-end hard-tail bikes.