HD/Blu Ray Camcorder Questions- HELP!

[everylastbreath]

As I previously posted I purchased the Sony HDR SR5, but I'm thinking about taking it back and getting the Sony HDR-SR7, because I found the higher model for about $50 more than the model I already have. Can someone who knows camcorders look at the specs on both and tell me if I should go for the upgrade and what the differences are?? Thanks!