Actually for coin shooting in your soil described as light to moderate mineralization, in my opinion the Silver is all you need. Being familiar with your post on that other forum, if I recall you are a silver coin hunter. When set to cherry pick with disc set just shy of zincoln the Silver is as deadly as it gets up to it's depth limit. In my mild soil it's depth limit is 8". The Silver has such sweet tell tale audio that grows on you. This year I added a Tejon to the detector fleet and love it for it's sensitivity and amazing depth, but the audio of the Silver is hard to beat. When I am looking for silver and set the disc to cherry pick, very few things can fool me for a coin. One is a twist off bottle cap with the sides bent in and a few certain bottle tops. They are just the right conductivity, round, and can sound sweet as a coin, even when checked from two directions. Other targets like cans and large metal can sound sweet, but their size gives them away when pin pointing.
The stock 8" coil on the Silver is amazing. You get decent coverage and it separates amazingly well. I don't own a 10 x 12, but plan to get one. Michigan Badger swears the silver with this coil is as deep as he has seen. Several others have claimed the same thing.
While I like Tesoro's Hot series of detectors, the uMax's are just hard to beat. The audio and disc. on these are just a perfect mix.
For coin shooting I really think you will like the Silver. Turn the disc down and it will get gold and nickels with no problem.
For the price it is hard to beat, simple, and just flat-out effective.
If you want to take mine for a test spin, just shoot me a PM. As I recall you do not live that far north of me.