projector: Sony vpl-hw30es, coming out next month or so, MSRP ~$3600, should be able to get it for around $3k. specs look so good on this projector, you will need to spend a lot more to get something might not be as good. I am actually looking at this to replace my old 720p projector.
Screen: ? no recommendation, as I haven't done any research on screen lately, I have a dalite hipower, but the gain might be too high to go with the new sony projector.
Processor: marantz av7005 7 ch preamp MSRP $1500, street price ~$1300
amp: Sherwood Newcastle A965 7ch amp, ~$700
whatever you buy, avoid Onkyo. They might have all the bells and whistles and low prices, but they are just not worth the hassle with high failure rate and nonexisting tech support. I am actually using their top of the line receiver TXNR5007 and had an issue with it in the beginning, a new firmware eventually fixed the issue and now I am hearing a lot of their receiver owners are experiencing bad hdmi board, a $1000 part if it is out of warranty...so I will never buy another Onkyo gear again.
This should leave you ~$5k for the rest. I don't rec any speakers without knowing what kind of sound you are looking for and room dimensions, so you should do your own audition. Good luck and have fun picking out your stuff.