What is the best practice for upselling features?

I’m trying to add a new feature to improve our product in the site. Currently I have this:

  • Explain the specific features of the product and price packages.
  • Display an order summary on the right hand side of the page:

mockup for the above points

If I want to add the new feature here, where would be the best place to put it?

I was thinking it could go either inside price packaging, the order summary or on the next page?

What do you think? Do you have a more effective way to explain the different features and price plans for a product?

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