Tesoro Tejon works good around cellar hole type sites. It's a no frills machine that doesn't even have a screen to lie to you. It won't find coins a foot deep unless you run in true all metal mode though. And around old home sites there's too much stuff in the ground to run in all metal. Just remember old is not always deep. The cellar holes I work are in the woods and stuff I find is not deep at all. The deepest coin I found was maybe five inches. The most shallow and oldest coin (1795-97) was less than two inches! A true all metal machine will give you more depth and sensitivity to small targets. There is a difference between all metal and zero discrimination. If you really want depth consider a machine that has a true all metal mode. But, be aware that to run in a true all metal mode the site has to be fairly clean and the machine needs to be balanced. Plus, in all metal you can't discriminate. You dig it all. That's when the relics start coming out of the ground.
-Swartzie