I think you should stick with what you know and insist on cash. I've used a bankers draft before (buying a house) but I probably wouldn't recognise a reasonable forgery. Unless you are there at the bank when the draft is issued, I can't see how you can be expected to know that it is legit.

I've bought two cars recently and in both cases there was no discussion about payment methods, both myself and the seller assumed it would be a cash deal. If I had a buyer wanting to give me anything other than cash I'd be very suspicious nowadays.