TOPIC: Items for Sale

I'm developing a site that will sell online backup in certain amounts of storage and will be offered in two types of packages. For example, the Home Package will consist of choices like 5Gb for $5 per month, 10GB for $10 per month, etc. The Business Package will be similar except a quantity will need to be chosen since the amounts will be in 1GB chunks. Obviously this isn't really an event of any kind, but the customer will have to create a username and password as well.

Basically I need a form that allows a customer to choose an item in a package and one of those packages will need a quantity dropdown, as well as user registration, and then of course PayPal Standard integration to make the purchase.

Something very similar to this...
http://goo.gl/KaHjk

Hello. DT Register will allow you to create fields to represent your different packages and then calculate the price accordingly. The username/password for login account can be done too. The only thing that would be missing is a recurring payment. DT Register can handle the payment, but just a onetime payment. It will not setup a monthly subscription, which it appears is what you need.