I would need a cart that is mainly to sell phone cards. So Customers should be able to login , brows cards, search cards by specific country name and see results of cards saved on database. Click the thumbnail and buy it and checkout using paypal and google checkout and at least one more payment gateway using instant verification.
I don't care if you use or have a module for opensource but as long the functionalities are there I should be okay. Please show a demo if you already have one built.