For a real Disney feel, definitely the POP. This resort is very alive, colorful and themed wonderfully. I have never stayed at any other resort like it before. Only at Disney will you see giant Rubik cubes, computers and Sony walkman icons. The lake is beautiful and it offers a nice alternative to the liveliness of the resort. For a more peaceful stay, ask for a lake view room. We loved ours!
CBR left me underwhelmed. Way too big for us. The theming was beautiful and the resort felt very beachy...but too spread out.
As for CSR, well I plan on resort visiting during our next stay and those pictures made me curious enough to go and check it out. May even try the Maya Grill if they have availibility.
Good luck making up your mind (it's half the fun right?) Happy planning!