Sometime back I went through the entire list of "RCI resorts available for DVC members" noting those I've stayed at. I can't find the post now -- but I believe my total was somewhere near/over 30 of the properties offered through RCI. Giving recommendations from my experiences would be pointless w/out knowing more of your travel goals/desires. What general areas you are interested in? What activities? etc.
I would strongly advise joining the Timeshare User's Group (TUG) for access to their collection of Resort Reviews. Lots of great info on (nearly) every resort out there?
UDATED: Still looking for my post regarding RCI-for-DVC resorts visited. In the meantime, I did find my list of II-for-DVC resorts visited with brief comments: link.
The list of resorts and seasons I'd recommend for trading DVC is very limited. I'd stay at others but not at the costs involved for trading DVC. To generally list the ones of the roughly 500 is a daunting task at this point, did you have any areas in mind?