As an afterthought: if you do get someone else's account, the only way to keep a character from it for tabs, is to transfer it to your own account after you got it. Then it wont matter, if he proves ownership to Sony and gets back the control of his account.
(Sony asks several things to rpove ownership, and if he can do that, he will get control back. This are things like CD codes, numbers of cards being used to pay, and so on, things the original owner would know, but not you.)
Having played an enchanter, I would not recommend buying one, as you will probably become frustrated soon. The class plays different from necros, mages and the other casters, as it is more passive. Due to many nerfs to chanter powers he lost also his former punch (charm worked better in those days than now, where are many mobs simply "immune to charm"), and at high levels you run into the problem that your mezz spells dont work, too, if your groups targets are too high. Former famous chanter techniques have also died, like the "stun circle", because chanters dont get useful AE stuns anymore (below 55 it works fine), and many mobs have become immune to stun.
If you play one up, you will probably be happier, as you know what does what, and how you have to act against various mobs (and how to control your group).