I'm sorry, I don't know. It depends on so many factors as to how much it would cost that it would be impossible to judge. Add to that the fact that I've owned Boardwalk DVC for 17 years now and haven't paid cash in that time, so I've no idea what 'normal' costs are to begin with!
Good luck. I know there are lots of people that swear they save money by renting from an owner. With you wanting a specific room type and view, I think it's worth checking out, is all. Just pay attention to all of the details - the DVC program is confusing even to those of us that have owned for a while. Make sure you notice the dates - it's my understanding that the 'classification' or what-have-you that DVC goes by in terms of seasons is rather different than normal. What may be a cheap or expensive season for cash is often an expensive or cheap season for DVC. And, of course, there are the drawbacks - no
free dining, no daily cleaning (unless you pay extra), usually no cancellations or changes allowed, etc. So take those into account when you make your comparisons as to cost.