My wife and I had a new home built and we close on Friday, assuming the world hasn't ended (fingers crossed). In the house there is a 17'6" * 11' media room with 2 3' x 3' 'nooks'. I had one of these nooks finished out into a closet with the window insulated, drywalled, and painted over, an A/C vent about a foot off the floor, and an exhaust fan in the ceiling. This is my media control room for the entire home (hopefully). From this room I have 6x Cat6 cables running to each of 6 locations I may at some point want a TV, so 36 total runs. Each plate of 6 will have 4 spots dedicated for 2HDMI conversions, 1 spot for standard internet connectivity, and one spot for an RF receiver.
This is where the HTPC need comes in. I have put together several 'standard' computers so the building isn't the challenge, but the what to build, because I am a noob when it comes to what all I can do. Heat/Noise/Space are not a major concern because the entire room is designed to pump cold air in and take warm air out, and has a door. My main goal is to have a system in this closet than can provide a wide variety of media (2D/3D/Streaming HD, etc.) to the various locations throughout my house, using the wiring I have already done. Spare parts wise, I have a moderate collection and I will try to get a full catalog of spare parts fairly soon. My main question is, with a reasonable budget (let's say $1500 for now), what is the best route for me to take in my situation. I realize this is probably not enough info so please ask me any further questions that would be useful.