Pay via PayPal and fund with a credit card. The seller will have none of your credit card info and you will be protected. Sellers don't see your credit card number (it is safely encrypted through PayPal's server), which limits the risk of unauthorised use. For buyers there is no more secure way of payment than Paypal with a credit card. Paypal is always going to provide you with the best protection, especially if you use a credit card to fund your PP payments.