Best shopping cart software for PayPal use?

[Xcellere]

I'm developing a t-shirt e-commerce site at the moment, and I'm using PayPal as my payment collection intermediary. My question is what shopping cart software do people prefer that has PayPal integration?

 

[Modelworks]

There are quite a few on the paypal site, somewhere to start at least.
https://www.paypal.com/en_US/h...ry/sd_wp-standard.html