Damn...I've been studying the top-end machines trying to decide on a purchase or two, hopefully in the near future (health permitting). Is minelab telling me that the manicore is five times the machine of the x-terra, the nox is four times the machine of the x-terra, or that I really don't need a top-end machine? Is selectable freq. really that much different than single freq.? Is the x-terra pro a step forward or a step backwards from what they have been saying for the past few years about single freq. being obsolete? Is it now proof (taking a few words from Nokta) that the tech is so close that it makes little difference?