Wow, $1300 difference, what resorts are you looking into? And what kind of prices are you finding for the condo?, if you don't mind me asking. That seems quite steep.
The disney buses would come in handy if your group decides to split up. But ,even when staying onsite, we have a rental car. Navigating around the property isn't bad at all, although I have heard International Drive can be a nightmare. The Lake Buena Vista, Downtown Disney areas we never had a problem with.
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I have 3 bedroom pool house quotes from several places that I found on the web, Mouse Pads, Allstar Vacation Rentals, Holiday Villas. All from about $960 to $1160 for 7 nights. We are going to drive so we'll have our vehicle there either way. I am really having a difficult time deciding.