Starting Out - Whole house media center

I've spent some time and read the FAQ and searched the forums.
Found a lot of information and I'm trying to put it all together.

Here is what I am trying to do.
Configuration:

A centralized media center that can be used to serve content to
any TV or PC in the house. This would include:
1) All the channels I subscribe to on Cablevision.
(I do not get HBO, or any Pay channel)
Idea is to have two cable boxes attached to the media server.
2) Anything available via the Internet
3) Recorded programs
4) Movies or shows ripped from DVD
5) Pictures
6) Music saved on the media server.

Each TV would have an HTPC device connected to it, via HDMI.

Goal
To go to a TV and access the content. This would include accessing
an available cable box attached to the centralized media server. This would
allow me to have TV's in many rooms but no need a cable box for each TV.

I have no problems working with MySQL as I have a lot of experience with it.

Am I reaching or is this possible?
If this is in another forum please let me know.

If someone has already described this configuration please just point me
to the link

My thanks to all who have come before me and worked this out.

MrJagDad.