I/m contemplating my first metal detector purchase.I'm a beginner.So far I have read about a couple of different manufactures(garrett,Bounty hunter).I'm primarily interested in coin,jewelry detecting.I anticipate spending apprx. $90-200.Is there an advantage to having Automatic Ground Tracking as stated by Bounty Hunter?.Also what features do you feel are a "must have" for the price range I'm looking at?.Are there other manufactures I should consider in this price range?.Thanks for all responses.