Run a conduit from your basement to the attic just in case you forgot something. Couple cat 5's and coax to your TV locations. 22 gauge for alarm wires. Don't forget power at your TV locations if they are going above fireplaces. Also, if planing on TV above fireplace, where is your audio equip going? Run conduit between fireplace and cabinet to side . 1 1/2. Any speaker wire you need ran, do it now. ( you can use coax for long subwoofer runs)Let me know if I can be of assistance. I've been doing this for 18 years. Where do you live?