1. I often use Speco DVR's for cctv. Very simple to set up for remote viewing. Has iPhone/iPad/Android apps, and a pc app for viewing/reviewing. A 4 channel DVR is pretty reasonable. The D4CS retails about $800 There are also lots of decent 600tvl, d/n cams out there for under $150 ea.
2.Legrand/OnQ makes a pretty decent basic intercom system that works over cat5, and the stations fit in standard electrical boxes. Depending on exactly how many stations you need, they have pre-built packages. They also make a variety of structured wiring enclosures and distribution modules.
3. The Nuvo Essentia is a decent economical option for 6 zones of audio. I have used Nuvo many times, easy to install/ program.