I don't know how easy it will be to move from Volusion to your own application, but I would imagine it can be done. The basic process is you'd need to export your database and then import it into the new application. You'll probably need to reset all the basic configuration of the cart with the new application since they'd likely be different.
One issue with the database is that two applications will have two different database set ups. It should be easy enough to export the one database, but it then needs to be converted to a format the new application can use. That's also doable, but the ease depends on the two applications. You'll likely need to redesign for the new application as the old one probably isn't going to work. I mean the development part and not the look. Each application will have a different system for adding themes or skins or whatever they call it.
In all honestly you're probably going to pay a lot more to move the site later than to set it up today. That's why I usually think it's best to go with the more future proof option. Obviously I can't guarantee you will want to move the site down the road and I can't guarantee how hard or easy it will be when the time comes. I prefer to build things today that are closer to what I think I'll want a few years from now than what's easiest now. I'd rather spend more time learning now than having to change later.
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