PSIGate & Shopping Cart

Hi Everyone,

I am planning on using PSIGate.com for my merchant account and gateway for an online site I plan on doing.

However I am not sure of what shopping cart to use with them. This payment portion of setting up an ecommerce site is still very new to me.

Have any of you guys used PSIGate, and do you have a recommended shopping cart to interface with thier gateway?

Also, if I plan on having recurring payments for my service, do I need to store credit card numbers?

If the user wants to change their credit card information, is this done thru my website interfacing with the gateway? Or do I store the credit card information on my database? Ideally, I don't want to store credit card information for security reasons.

Thanks!!!