We really like the combination of owning both DVC points and our EOY Marriott and Fairways week. Our other two timeshares are lock offs so essentially we get 2 to 4 trades out of those weeks.
When I locked off our 2 bedroom Marriott, II gave me a bonus week/AC (Accomodation certificate) for the 1 bedroom deposit, so I had a studio to trade in II, the bonus week, and the 1 bedroom. On my Fairways week, it is a very large 2 bedroom with 2 kitchens in it that actually locks off into 2 one bedrooms. Since I own Week 27 (holiday week) II usually gives me an AC for both sides, so I get 4 trades out of that ownership.
By owning DVC points, I get the perks of being a DVC member, plus I can call DVC Member Services and book what I want, when I want it. I'm not at the mercy of II "hoping" a DVC shows up. Plus, we get the member discounts. We just renewed our annual passes - gotta love that $100 discount.
We take advantage of the extra cash vacation opportunities (Getaways in II) quite frequently. And like I said, we just joined RCI recently in order to take advantage of their Getaway weeks and Last Calls, as we fly down to Orlando pretty frequently and can travel off season.
I'm not a strictly "I've got to stay at DVC every trip" type of person. So a combination of DVC and our other resort ownerships work out great for us. We sometimes book 5 nights on DVC points in studios (and let a son-in-law and daughter take the studio) and my husband and I will stay in a Marriott 2 bedroom. We put our name on the DVC reservation so we can come over and swim with the kids or pop into the Disney parks. But then we sleep in our roomy 2 bedroom over at Marriott.

The DVC studios officially sleep 4, but I wouldn't want to stay in a studio all week with 4 adults.
Disney had a special not too long ago where new members could buy 100 points at Animal Kingdom Lodge directly from Disney. I don't know if they are still offering that, but if you're thinking about around 100 points, it might be worth checking directly with a DVC guide to see if that is still going on. Usually when you buy direct from Disney you get a loaded contract and you can use your points immediately. Keep in mind that SSR and Animal Kingdom Lodge have the longer ending dates (2054 and 2057 on the RTU). Most of the other DVC's have ending dates of 2042 (except contracts at OKW that have been extended). If you need a DVC guide's name, PM me and I'll give you my guide's phone number. She's a peach.
If you go resale for DVC, The Timeshare Store has a good reputation. They sponsor the Dis boards.