You should try to demo some different bikes to find out what you like. The Path in Tustin often has Santa Cruz demos. I've seen Giant have a demo fleet right in the parking lot at the beginning of the Fullerton Loop. Look for demos on the websites of different brands and local shops. I think you're on the right track with a bike like the Tallboy. If the Loop is in your regular rotation, the Hightower would be overkill. And don't forget about tires. Geo and suspension are important, but having the right tires for the terrain you rides...