Thank you everyone for advice and feedback,
My DH and 7 yo DD are thrilled at staying in the cabins. My 17 yo DS was hoping for YBC and Stormalong Bay, and my 14 yo DD was hoping for POR! I'm liking the FW cabins because of the ability to preorder gardengrocer and have breakfast and dinner at the cabin, with a nice TS lunch in the parks each day. Plus, I can live off of 2 meals/day, but my teen DS is starving a hour after a meal, so I think the cabin is going to keep his tummy happier than if we were at POR. I'm cringing over the $45 (?) per day golf cart rental, but I know I'm not much of a power walker, and as CapeCod53 pointed out, teens love it (and it might win my teen DS over if he can drive). We are staying 5 nights, no car, with 4 solid days of parks (just getting back to the cabin by early dinner time).
The AS Music Family Suites aren't available during our travel dates, but I'm not much of a Value Resort fan -- I stayed once at POP, and it was my only negative Disney Resort experience in all my years of visiting WDW. And I wouldn't dream of staying offsite again, since I'm a diehard Disney Magic junkie, and offsite resorts just never cut it for me (even the high end ones like the Hyatt or Marriott OWC).
Thank you CapeCod53 for the loop location suggestions, I'm taking your advice and asking for the 2500 loop.