BLT has lowest dues per point. Through Disney, lowest add-on resorts are HH and VB for $80 a peice, SSR is next lowest at $99. Those resorts resale prices in the resale market are much lower than those numbers.
The approximate annual dues per point for 2011 at each resort are:
Bay Lake Tower $3.90
Grand Californian $4.07
Aulani Villas $4.31
Saratoga Springs $4.52
Old Key West $4.99
Animal Kingdom $5.02
Beach Club Villas $5.28
Wilderness Lodge $5.35
Boardwalk Villas $5.46
Hilton Head $5.68
Vero Beach $6.78.