Well as far as that goes:
Carribean Beach is probably the most centrally located of the bunch, it is kinda inbetween EPCOT, MGM and Downtown Disney.
Coronado Springs: This is located in the Animal Kingdom area so it is REALLY close to that, but a bit more distant from the other parks especially the Magic Kingdom
Port Orleans Riverside & French Quarter are right next to each other and have pathways between the two. The advantage is that they are sister resorts so you can stay at one and use the pools etc at both. This is also fairly close to EPCOT and as mentioned before just a lovely boatride to Downtown Disney ( buses go there also)
I would still say to go with whatever theming happens to rock your world, as once you are on one of the Disney buses which go to the park, it isnt more than a 20 minute ride or so in any case.
Hope this helps!! Belle