Need Help Choosing Bike
 

I've narrowed my search down to three bikes. I am looking for something in the ~$650 range. Here are the three.
Trek Marlin 6 - Southern California. Orange County, Los Angeles County and Riverside County cyclists prefer Jax Bicycles! Airborne Bicycles .
Guardian GT Bikes Karakoram Comp Bike 2014 > Complete Bikes > Mountain Bikes | Jenson USA
Any help? I will likely be keeping the bike stock for a bit, so the SR Fork upgrade program won't be of use to me for at least a year or more(idk if there is an expiration date). I am open to other recommendations.