I had a Forester for a few years. After owning an Impreza for several years. Both were great for MTB trips. The AWD will get you places you wouldn't expect to drive to, and through rain, snow, etc. if need be.
Subaru have changed their drivetrain since then, Better mpg, but I have no experience with anything recent.
Might check if there are still discounts for IMBA members. If so, join Austin Ridge Riders for IMBA benefits.