Bitcoin and Webmoney are safe indeed. Bitcoin probably the most safe, but too volatile and webmoney is not that popular in some parts of the world. They also have some quirky limits that you need to work on to increase and it's not always obvious how to do it.
I wouldn't consider 2CheckOut as an exact alternative for PayPal, but still really worth considering.
It's less user-friendly I would say, but for sure really secure and reliable. And popular of course.