I've noticed that when I try to pay with paypal, it really limits my options on shipping.
For instance, before I go to check out with paypal, I'll have the option to do UPS next day shipping. I live in New York, so next day shipping is possible here. But.. when I go to check out with paypal, the shipping options change to pretty much being just priority mail.. with a little note about the shipping to Mexico, Hawaii, Alaska, etc..
It's very strange, as my paypal addy is the same one that's on here. The address is an NY addy, so I can't understand why this occurs.