Two box is great for covering ground quickly but if not set correctly can also easily ignore a small cache. I like the Sierra Madre for cache hunting because I can detune on the fly,and it's light weight. I usually use a big coil on it but not always, it's about as basic as it gets but simplicity is what you want. For relics I still like the old Sovereign. Cache and relic hunting is kind of a dig everything game, most any detector will work but a probe will be your best friend. Like my realtor says...location,location,location.