Depending on what your budget is,
The best value for the money is Pop Century!
It's new(compared to others), Value and clean and the staff is professional
We have a long stay as well on Property so we split 1/2 at Pop Century 60's bldg and a Moderate resort, alternating between Poly or PO Riverside.
If you do PO and you rent bikes/or love the boat rentals, get the "captains plan" it's not advertised alot* and you can rent the pontoon boats/reg bikes/water sprites/ as long as you want for the one price at the Marina for your length of stay for like 225.00 including taxes. The bikes with the canopies aren't included-they are owned by a private company other than Disney.
Whatever accomodations you choose, have fun and enjoy!
If you want off property, try onlinehotels.com
they have great prices for off property, usually near Universal or MGM areas.
Have a great time!
