Onkyo vs Denon vs Yamaha vs Marantz..... Definately go Marantz, but wait for the new 500 series (SR 7500, SR 8500, SR 9500) because not only do they upscan all video signals to component (so you only have to use 1 input on your display), it will also have DVI switching too. All switching is broadcast quality too, so you don't loose as much in quality as compared to other receivers. They have great power and fantastic audio quality
These will be out early in the new year.
DVD player? I would wait for a Marantz Blu-Ray to get a really good one...
But they currently make a DVD/SACD/DVD Audio with PAL/NTSC Progressive Scan, and plays just about everything, also has DVI output.
Speakers? Go Dynaudio if you can www.dynaudio.com
If not Jamos or Jensens are good (so are many European brands)
Display? NEC PlasmaSync, or JVC DILA projector, if you want a cheap but good projector check out the Panasonic PTAE500 with 3 LCD chips and native 16:9 for about $4000 (no flyscreen effect, and good colors too)
It would be difficult to squeeze all that to $10,000 including display, if you up the budget to $15,000 which may be very difficult, you could get yourself an unbelievable system there (including display) - that would allow you to spend the most on speakers too, which is what should be done)