If you don't mind the chrome color, the Motobecane 700 HT is an awesome bike. With Shimano Deore front and rear (XT) deraillurs, shifting is going to be very smooth. It also has 27 speeds, which comes in handy when you need an extra gear for steep hills. RockShox Dart II forks will absorb many bumps, and provide a lockout option for long stretches or flat trails or hiss climing. Double
Wall rims add extra strengh when jumping.
If you do purchase this bike, one thing to keep in mind, as with all mail order bikes is that you will have to do the assembly and maintenance yourself, which a local bike store will provide for free if you purchase your bike from them. Of course, you will have to pay an extra $200 - $400 for the same calibur bike, so that is something you will have to keep in mind as well.
One of the weaknesses of this bike is the seat, so you may need to invest a few dollars into a new one. You may also have problems with the seat post. You may also find the rear deraillur a bit tricky to fine tune, which a local bike store will do for you at a small cost. In any case, the Motobecane 700 HT is a very solid bike for the money, and fiding a comparable bike for the same amount of money at your local bike store will be extremely difficult...