If money were no object I would probably go with the following:
DIY speakers using
Seas Excel drivers in well designed/built boxes with cherry veneer and a high gloss finish. I estimate the price to be around $5,000 including all materials. This one will hopefully become a reality some day.
Subwoofers would be DIY as well. I would probably build 2-4 large subs using
Ascendant Audio Alliance 18" drivers and sufficient pro amps. Cost: $1,000 - 2,000
Amplification would be provided by pro amps. Even with with no budget constraints I wouldn't splurge on "HT" amps that cost many times more. Carvin, Behringer, and Crown would be candidates. Cost: $600 - $1,500
Cables would be DIY using RG-6 except for the HDMI cables which would DVI-Gear or BlueJeans.
I would get the best pre/pro I could find. I have no idea what that would be because I have never researched any other than the Outlaw models. I can't see myself spending more than $4,000 on one.
A three-chip DLP projector shining on a Stewart screen would be my display choice. The cost? Probably around $20,000. If, by chance, large scale OLED displays (100+ inches) become available that would be the ultimate display.
I would build an HTPC with as much storage as I could fit into the
CoolerMaster Stacker case. I would store every type of media on it and use it as a server for a whole-house media system. Iwould keep the PC in a seperate room along with most of the equpment and have a DVD drive accesible in the HT room. It would cost $3,000+
Room treatments would also be DIY (see a trend here?) and the room itself would be constructed as perfectly as possible for home theater.
The rest of the house would have strategically spaced in-wall/ceiling and bookshelf speakers and multiple subwoofers for distributed media as well as PC's/control modules for many zones. I would have several "secondary" systems in bedrooms and family rooms.
I would have a fully furnished wood shop with a top notch sound system and all the luxuries for building all of this stuff.
I hope, some day, to make at least some of this stuff become a reality.