components will always be a personal choice...
depending on what components you choose can also determine how light your bike will be.
we just chose a straight up XT gruppo, you can order them as a complete kit, the only thing it does not come with are fork & pedals.
you can also order different type of gruppos (LX, XT, XTR, Sram) or hand pick the super light components.
I did this many years ago to my Sycip steel hardtail frame, I hand picked the lightest possible parts, it was pricey but ended up with a 20.4lbs MTB bike with front shocks.... It was fun to ride...
good luck with your choice of bike... you can not go wrong with a DD , very well made and built my only one person, attention to detail, alignment, powder coated paint job, and a ventana rear end are great = an awesome ride.
Hope this helps