Wildflower, it depends a bit on the time of year your going. You can see the rack rates before tax at;
http://www.mousesavers.com/dvcresorts2010.html for the BCV (just scroll down to BCV) and at
http://www.mousesavers.com/yachtclub2010.html for the YC. As you can see, a 2-bedroom villa at BCV at rack rate is already cheaper than 2 YC rooms, when going during value season. Going by your mention of the 100-day mark, I'm guessing your going during the second part of april? At rack rate regular season, the 2 bedroom would be a bit more expensive per night than 2 rooms at YC.
The PIN-code for DCV is at least 40%. I've heard some folks about 45%, but didn't check on that myself. If that would be true, the price for the 2 options might become very comparable.
What you could do, is have them pricing out a 2-bedroom villa at BWV, assuming they've got availability overthere with the PIN. Those villas are priced at the same rate as those at the BCV, so that way you would get a good idea of pricing.
Another thing you might want to take a look at is the picture thread. The looks of the BCV is different than those of the BC rooms. Personally I found I didn't care for the BCV look, but do for the BC and YC look.