Check out Super Circuits:
http://www.supercircuits.com/
At work we primarily use Pelco, Amercian Dynamics, Axis, Sony, Sanyo, Arecont, Vicon, etc. but these do not normally fall into the "residential use - affordable" realm.
Supercircuits has more of the consumer level products. They have some cool kits that have the DVR for recording, cables, power supplies, cameras and mounts all bundled under a single part number. Loads of individual camera and housing options too and mostly all affordable.
Some smaller board cameras (minus housing) tip in at less than $40 and the image quality is decent.
If you don't want to be bothered with a separate DVR for recording, you can opt for IP based cameras on your home network, but the price starts to ratchet up. Cabling for those is standard Cat5, so it may help offset.