I am new to metal detecting & thinking about buying an ace 250 as I've already read from ya'll is a great starter detector. I don't understand all of the description in ads I'm so new to this... Does it have where it shows what youre' digging for? an actual picture or outline of item? would it be better to get the GTAx 550 Coin Discrimination with Visual Target ID now if I can afford it? do they both have that? I would really like something that shows what the target is & goes as deep as possible. Is the coil size just for how big of an area it sweeps at once? any info anyone can give me would be most appreciated.