Don't "bundle" your different multimedia cables together. The whole concept behind cat5 cable is that each twisted pair is twisted at a different rate to prevent RF crosstalk between pairs (read: interference)
However, if you bundle that with catv and security system cables, there is no guarantee you will avoid rf contamination.
cat5 can homerun up to 400 feet, and no more. For home systems, it works well to buy a 10-100 base T hub of 8 or so ports to allow for expansion. The hub should be at your main server computer, where your dsl or cable modem and printers are, although the printers don't HAVE to be there. Many printers will accept a network card of their own and operate independently of a computer.
Then wire your cat5 to all the other rooms in the home, ideally to a cat5 wallplate which can be combined with telephone.
DO NOT combine low voltage with high voltage in any Jbox. (the plastic box the light switches and receptacles fit into) This is a violation of the NEC.
As far as home theater, you can go spend $$$ on monster cable, or you can use my favorite, 14 or 16ga lamp cord. It's less expensive but does essentially the same thing. Make sure you choose cord that identifies one wire from the other, usually with texture on the insulation of one wire. The farther away your receiver is from your TV, the better the AM reception.
There are companies who will wire all of your hitech wiring for you, and do it right. The problem is, you won't know if you did it all right until after the walls have been rocked and painted, and then it's a little late to fix it. The pros also know all the right questions to ask, and suggestions to make to maximize your system. At least pay to have one come out and give you some help laying out your system, and then cable it yourself.
Your electrician may do this as well, most of the electrical subs I work with do.
Good luck, I applaud your efforts to be "wired". It won't be long before new homes are sold with existing networks and home theater, including all the hardware. What a great marketing tool!