I'm currently redoing an e-commerce site and I need to decide what payment options to do. I would like to use Google Checkout for it, but I'm not sure. What are your opinions?
For a small to medium volume site, paypal pro can easily integrate in a site now. Rates are very good. For a large volume site, authorize.net dedicated credit card processor is ideal.
I think starting out paypal is one of the most popular solutions for a business. As others have said though, for a large volume of sales you might consider a merchant account (2checkout, authorize.net,etc.)
I used Paypal in the beginning and it was ok. I think it's even better to use it in the beginning, because buyers trust PayPal.