Join up with PayPal as soon as you possibly can.
It is amazing how many companys out there 'can't find' your transaction details, even when you include all the relevent information.
It doesn't matter how much I want something now, if they don't have paypal, I don't get it!!!
Avoid these sellers 'oz-auctions' & 'pirteke'. I paid them immediately, then still got non-paid disputes against me.
Don't forget to check the negative & neutral comments,they usually say more than the positive.