Agree with both PPs. While my favorite resort is my home (VWL), I wouldn't say it's right in the middle of the action. But, during the holidays, there is no more beautifully themed and decorated resort. As mentioned, though, getting in anywhere other than SSR or perhaps OKW within the 7-month booking window could be difficult. We've done split stays, too, and if you're willing, that is a good way to be closer to the action of various resorts since there is no one "central" resort. Below are my thoughts for each resort.
BCV/BWV: Can walk to Epcot and DHS (the latter is a longer haul, though), and the location of BWV puts you right on the Boardwalk where there is a lot of action in the evenings. BCV guests can get to the Boardwalk with a short walk.
BLT: Easy walk to MK, and it sits on the monorail which means access to Epcot (though you have to switch monorail lines at the Transportation Ctr).
GFV: Also sits on the monorail which gets you to MK, but also requires switch at Trans. Ctr.
SSR: Not terribly close to any park, but is a moderate to long-ish walk to DTD.
OKW: Again, not "in the action" vis-a-vis any parks, but the suites are spacious given it was the first
DVC resort.
AKV: While close to AK, you must still bus or drive over. Considered one of the most, if not the most, remote resort by many.
VWL: A small resort, and traditionally the hardest to reserve at 7 months out from the holidays, it does have a boat to MK and the CR; otherwise, it's bus or drive.
All the resorts have their strong suits and weaker points, but each is lovely in its own right. Again, even right at the start of the 7-month reservation window, a few of these resorts could be difficult to book, particularly VWL and GFV. Good luck!