What can you tell us about the room that this is going in? I assume it's NOT a basement, and is probably a pretty bright room (hence the Black Diamond screen)? What about size?
I can see that a good chunk of the budget is going into the projector ($4k+) and screen ($2.5k+). I suppose if ambient light is a major concern, then perhaps the extra money is necessary, but if it's not a major issue, then you should maybe research some of the new 1080p projectors that are coming in at roughly half the price (and are very well-reviewed). There are also many other less expensive screen options.
If you haven't already, check out
projectorcentral.com and
projectorreviews.com for detailed reviews of projectors (including a number that have just recently become available).
Edit: As far as the speakers and reciever go - I think those are fine choices. I've always been a fan of Paradigm, and the Yamaha looks as though it's got all you'll need to experience the best of what's out there.