My wife is an avid bike rider and wants to buy herself and I new mountain bikes. Her current bike is a Terry road bike and I have a Diamondback cyclocross. I know nothing about mountain bikes. I'm thinking hard tails would suit us for the trails we have near us aka Alum Creek. She will not buy a bike online. Luckily, we have about every brand available to us locally. Even less well known brands like Kona are available locally. There is a KEI and a Performance Bike store near me. They offer the best pricing I think. I've always wanted a bike with Sram bits, but I can live with Shimano. Size wise, she is 5'8.5" 120 and I'm 6'2" 166. Would like to keep the bikes at $800 or less each. My wife is interested in the CO-OP brand bikes at REI. What should we look at?