Hilton Head dues are a bit higher than theme park resorts but not nearly as high as Vero. Aulani is also higher than HHI. HHI is only about $.20 higher than Boardwalk, $.30 higher than Animal Kingdom.
A list of all resorts for 2014 can be found here:
http://dvcnews.com/index.php/dvc-pr...ews-19220/2439-2014-disney-vacation-club-dues
Disney's Hilton Head Island Resort is a lovely property and it has many fans. I just don't think you find them hanging around discussion boards too much. Hilton Head is a big leisure / golf destination. No need to continuously chat about attractions, parades, fireworks, MagicBands, etc.
HHI can be a very difficult resort to book, particularly during the summer months. The vast majority of the rooms are Two Bedroom villas, so smaller rooms are especially hard to get. The resort consists of 76 dedicated two bedroom villas, 21 lock off 2B (which can be separated into a Studio and a One Bedroom), plus 5 Grand Villas. So if you want to book a Studio or One Bedroom there are only 21 TOTAL rooms available every single night.
I've been to HHI a couple times. My biggest complaint--which I think most people share--is that it's not located on the beach. The resort is on a sort of marshy area a bit inland. Disney has a separate Beach House about a mile away right on the Atlantic. The Beach House is nice--it has a pool, restaurant (seasonal), some indoor facilities and direct access to the beach. A shuttle van runs between the resort and Beach House on a regular schedule. You can also drive or bike over.
Honestly I would probably recommend visiting the Disney resort before buying there. Just make sure it's the right destination for you.
Overall, HHI, Vero and Aulani (Hawaii) make for some nice non-theme park destinations in the DVC portfolio.
The other approach you could consider is just buying enough DVC points for your theme park vacations, and pair it with cash stays or a non-DVC timeshare. The Banking and Borrowing provisions of Disney Vacation Club provide enough flexibility that you don't have to visit a DVC resort every single year.