Well I guess PayPal is best payment service and reliable too if you follow their terms and conditions. PayPal is used by worldwide. Most of webmaster prefer PayPal then other. If you want any CC payment option then Google Checkout and 2CO is best.
Paypal is the most popular one...there are some other good ones as well which are less popular... google checkout,neteller.com and moneybookers.com
Paypal is too expensive. and they also have an attitude issue that will send them to internet heaven very quickly.
You can choose Alertpay or e-gold or moneybookers instead of Paypal... But i think paypal is best which is safe and secure...
They told me that there is a problem with my credit card. I have no credit card linked to their crummy company. Such stupidity deserves to be paid off. Plus if they are that stupid they cannot last long as a money transfer company, so I am thinking of starting a competitor to their service. I am sure I can do better than them. I need a website clone and that's about it.