Hi there Colleen and welcome to the Boards!!!! As everyone else here has said theming is really key to this question. As far as upgrading at all, from what I got in your post you are going in July, Correct? If so then I would seriously advise an upgrade. I think the grounds are nice, the theming more immersive, the pools more elaborate at the moderates as opposed to the Values. I have stayed at all 4 of the Mods and think you cant go wrong with any of them!!! Port Orleans Riverside is themed to the Antebellum South, Coronado Springs is themed to the Southwestern states and Mexico, Port Orleans French Quarter is themed to a very clean New Orleans during Mardi Gras, and Carribean Beach is themed to an Island kind of feel.
Riverside- This one is probably my favorite of the bunch, I stayed there three times alone last year out of six trips They have won awards for great landscaping. The sit down restaurant, Boatwright's has the best ala carte breakfast on property IMHO. Check out this bunch of pictures from one of our members who has given me permission to direct people to them. These pics include Riverside and French Quarter.
http://home.comcast.net/~candisfl/wsb/html/view.cgi-photos.html-.html
The front portion is Riverside, the last few are French Quarter.
Coronado Springs genrally tends to be my number 2 pic. It is the most "adult" of the resorts as it is also a convention center, so you may see people dressed in business casual clothing. The Main pool here is astounding. Some websites that show off this resort are:
http://www.wdwmemories.com/csr/
http://coronado_springs.tripod.com/
This resort is one of the "warmer" ones in terms of this is supposed to be kind of deserty similar to Mexico. Again always a great experience at this resort.
Port Orleans French Quarter is nice because it is the smallest of the Moderates topping out at jus slightly over 1000 rooms so everything is pretty close by and not such a long walk to your room after a hard day at the parks. Note this resort is the only one without a full service sit down restaurant, but you can walk to Boatwright's in under 10 minutes along the river that fronts this resort and Riverside, they are connected.
I stayed at Carribean Beach twice and wasnt overly impressed or turned off either time. They have a sit down restaurant that does have dinner now ( Get some brekfast going and Ill stay there more often!!) called ShuttersThe rooms were nice and the quiet pools were nice and relaxing. the Bus stops are laid out well at this resort and the island feel is nice. If anyone has a website for this resort, please post it!!
Hope this helps!! Belle