If you are using MOCA then you can use existing coax connections to extend the network and use old FIOS routers as a bridge to get wireless and wired connections.
PVC cement is not a glue it's a solvent. It "melts" the PVC then you push it together. All of the polymer spaghetti strands intertwine then the solvent evaporates leaving behind a solid mass of continuous plastic.
I was in Target once when they were having this deal. There was a misprint on the shelf and it said "Buy 1 get 1" and they honored it. So, keep an eye out, it was first thing Sunday morning though.
I second dd_rescue. It will be able to get what ever is readable off. You can run it multiple times forwards and back to have the highest chance of recovering your data.
I upgraded from a D80 to the D7100. The focus on the 7100 is a little hairy sometimes using an older Sigma 17-50 2.8. However the body has great feel and controls.