What's that supposed to mean??
I've got nothing else against the older models, and in fact considered getting a II because there were some great deals at the time. But since Minelab announced that they had quit servicing them, I decided to wait for the right deal to come along on one that they would still work on for at least a few more years. And now that the entire Explorer line has been discontinued, the days that they will work on any of them is numbered.
I'm not saying not to buy any of the others that you suggested. The OP has indicated that a $700 machine is in their price range, and that they are looking for an FBS machine. I'm sure that if an E-Trac came along in that price range it would be a done deal, but they could wait all summer and still not find one that cheap.