Volusion is a pretty solid product, but it can be difficult if you have no experience with website development (or so I'm told). You're right about the $65 plan, but keep in mind Volusion doesn't charge its own transaction fee.
X-Cart, I believe, is a self-hosted solution. In other words you have to download, install, and maintain it yourself. Other Products like Volusion or Shopify are hosted, so they handle all the backend stuff and support.
Speaking of Shopify, that might be worth looking into. I've heard it's easier to use for non-dev people, but they also charge a transaction fee of their own, ON TOP of the standard payment gateway fees (authorize.net, paypal, etc).
You can try most of these services for free, though, so I would do that before making a decision.
In late, but I hope this helps...