Lou, you are going to open up a poop-storm talking about Motobecanes from Bike Direct! But, I was in the same boat and ended up going with a Gary Fisher 29er from my LBS. Here was my thought process:
The Motobecane is a decent parts build, actually. Other than the 11-32T cassette, which is a little tall for a beginner, it's a pretty good build. The wheelset is just okay, but no worse than the Jamis (or most at this price point). I doubt the Small Block Eights would last long around here in the rocks and mud, but that's not a huge expense.
My biggest issue was the geometry of the frame: the standover is a whopping 2+ inches taller than my Gary Fisher frame (and the Jamis frame you are looking at). That made a huge difference to me in having a comfortable clearance over the top tube in technical terrian. Quite frankly, the Stumpjumper HT 29er is the same way...just a little to tall for me to feel comfortable. If you have exceptionally tall legs for your height, you'd probably be okay. If not, frame fit is a deal-breaker.
The Jamis is a nice bike for the money. The wheelset probably won't last if you are rough on your bike or a heavyweight. The brakeset is supposedly improved over older Shimano hydros, but I don't have any experience with them. Probably the two best reasons to buy the Jamis: you won't see many people on them and they are a NJ-based company.
Also check out the Gary Fisher X-Caliber. $1589 retail and definitely on par with the Jamis. SRAM instead of Shimano, Fox instead of Reba, both of which are personal preferences, but definitely a better wheelset (and tubeless ready).