Unsure about UK2's e-commerce reseller package

I'd appreciate some advice about reseller hosting. I'm looking at UK2's packages after many good experiences with them. The have two reseller packages, the more expensive of which is described as having a "white label e-commerce cart added as a one-click install."

(Here is the product description)

The first site I'll host on this package will be a florists internet shop which will need to be able to accept credit card payments and which I'll put together with drupal. Will the package with the "white label e-commerce cart" be necessary for taking credit card payments? Could I get away with the cheaper package?

Cheers