I believe that CDG should be able to handle international charges but you would need to ask them, I have never used it. I’ll pass this along to FoxyCart and see if they have better answer.

From FoxyCart:

We actually did some math with real stores that had used both, and CDG is likely a little cheaper up until you’re doing $10,000/mo (at which point you should probably reevaluate your merchant account anyway because you could likely negotiate a lower rate). PayPal’s much easier in some ways (reporting is easier since it’s a gateway + merchant account rolled into one; refunding is a slightly easier), but CDG+Quantum provide a lot more control over your fraud settings than PayPal does by default. And as of 2008 you need to pay an extra $30 to access the more advanced fraud filters in PayPal Website Payments Pro.