Do you want a hotel, or will a condo work? Do you have your own transportation, or will you be renting a car, or are you looking for a hotel that provides transportation?
When we took our first trip what feels like forever ago, we stayed at Nick Hotel because I had seen a lot of commercials and it looked fun. We were reasonably happy with the room, and we had driven, so didn't have the added cost of a rental car. Back then, parking was only about $8 or $9 a day, so that wasn't even too bad. The very next trip, though, I "discovered" disboards, and thus "discovered" Windsor Hills. Wow, my life has been changed! We now get a 3 bedroom, 2 bath condo for week for about what it would cost for 2 nights at Nick in one of their family suites. A similar contrast can be made for staying at one of the family suites at the Disney value (can't remember which value resort added these, but I know one did).
So, if you're looking for a condo, just ask. Many folks can give you great testimony about renting through vrbo.com or something similar. If you want a hotel/ timeshare type place, ask that too and many folks can share their experience with places like WBC (where the condos are beautiful and transportation is provided).
In the end, you have to remember Disney is VERY smart. They know exactly how much folks pay offsite, and try to price their onsite options at the breaking point where the value meets convenience. If you're an informed consumer and do your homework, you can absolutely save money offsite. If you want convenience - you won't find anything that compares to the onsite offerings...
Happy planning!