I know that paypal is the most used but well as you can see there much people that do chargebacks .The payment options I suggested could be a alternative way to pay for more Months without problems.
and to the liberty reserve thingy.. well its Stable, Reliable, Secure , Much Lower Fee's NO CHARGEBACKS and still used by very much people and the most used payment method on underground forums..
I just mentioned Western Union cause you can exchange your Western Union, Paypal Money Bankwire ,bank transfer,Credit Card and Moneybookers money into Liberty Reserve with 2 clicks.