I would say 12-13k with the miles being the condition you stated.
If it had miles in the 40-50s I would say 15-18k.
Doc check out lightningrodder.com for common sale prices.
I've been to both, yes lifestyle will have alot more eye candy. I've been with power shack for 3 years training for powerlifting. Lifestyle doesn't have the enough squat racks, benches, or free weights to justifiy me joining there. Power shack ftw.