Is $18,000 enough for a high end HT?

This will be my first attempt at building a HT. My room size is: 19'L x 11'2"W x 8'H. This room is a library. I want high-end stuff. I want my windows to rattle when the Apollo 13 takes off. I want to be tempted to get up and dance when a good music score comes on. I want to build it myself as I think it would be a lot of fun. I have plenty of vacation time that I could use. The following is what I would expect:

1. A projector with Texas Instruments' Mustang/HD2 and 16:9 aspect ratio
2. Recessed screen
3. 5 on or in ceiling speakers (Thiel or Triad I’m thinking)
4. 1 Subwoofer
5. DVD player
6. Power Conditioner
7. Processor
8. A 5 channel Amplifier
9. Cables for the items on the list

When I priced every thing I wanted individually the price came to over 25K. Bare in mind $18,000 is a lot of money for me. However, I figured since we spend a ¼ of our lives watching TV it is well worth the investment. I invested some money a few years ago explicitly for my HT. Besides, I figured if my wife is not happy with all the money I will be spending, I could just say, that I am not taking the money from our cash flow, rather from a fund specifically set up for a HT. I am thinking maybe I should pull money out now. But is 18k enough? I am not willing to spend that kind of money if I will not have a great HT. Perhaps I should wait a couple of more years until I save up more money and the technologies go down in price. (I'm concerned that I will say that in two years again as I did two years ago. There are always newer technologies coming out.) I have no experience with any dealer and want to know if I could expect such a deal from a reputable authorized dealer. I read in Robert Harley’s book: “Home Theater For Everyone” that choosing the dealer is far more important then choosing the manufacturer of the components. In my experience for other purchases I find this to be very true. It seems there will always be tech support issues. Also, when I want to upgrade and add components, the dealer will know exactly what I have and all of my issues and I would be able to get his/her valuable input. I plan on adding within the next year or so, an AMX system for control, a video processor and an HDTV set top box.

The cables I would start off not so high end as I want to see for myself over time if they make a difference. However, the cables that would go in my ceiling I would want high end because it would be a big pain to replace those. I would also be flexible with the projector, I would settle for a refurbished or demo unit (with valid warranty). I would even settle for a good one that has an HD1 chip and an XGA resolution. I have seen some of those and they are definitely good enough.