We have faced the same issue and here is what we did:
Our membership started in 2000 with a purchase at BWV. On all of our previous three trips to WDW on points we have solely stayed there (using our 11 month ressie rights to grab those precious two bedroom boardwalk view villas). However, our next trip (this May) we are doing WLV, which will be interesting - a "close to park" property other than the Epcot ones!
Like you, we then thought about -- and eventually did -- move to using points outside WDW. At first, we stated "within the family," using them to take a seven day Eastern Caribbean cruise on
DCL and to stay at the Grand Californian at
Disneyland (years ago prior to the development of the
DVC property there; nice hotel, albeit the smallest rooms I've ever seen at a Deluxe Disney property).
But like you we became eventually became interesed in going beyond Disney properties. So we have traded out of the program twice, once to stay at the Hilton Grand Vacations Club at the Flamingo in Las Vegas, the other time to stay at the Marriott's Manor Club at Ford's Colony in Williamsburg, VA. Contrary to the "trades are never a good idea" gospel you usually hear here, both these particular "swaps" were into properties that were at DVC standards and relative deals, in terms of comparative point cost (note - the Marriott time shares -- some of which arguably exceed DVC standards -- are unfortunately no longer available through DVC, since their switch from II to RCI).
The gospel I would preach on trading is to:
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Really do your homework on resorts, so you are sure on what you will get before you pull the trigger.
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Be picky but realistic. The best of the Caribbean options are available -- but no, not for trips over Christmas.
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Cast a large net . Make requests on mutiple targets for multiple dates.
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Think years out, not months. Make said requests as far in advance as possible.
We have also used the Concierge Collection option twice, once to stay at the Sagamore in Lake George, NY (absolutely incredible resort, highly recommended) and the other time at the Boston Harbor Hotel in Boston, MA (which is no longer offered). In both those cases we used the Concierge program primarily to use up points which -- due to unexpected events -- had not been used as originally planned and were approaching expiration.