ubernoobie :
This is kinda weird because you have a huge budget on top of a nvidia motherboard so that takes away corei7 and leaves you 790i as your only option for motherboard.
Do not know where you get your information from, but the Core i7 X58 motherboards can do either SLi or Crossfire.
Now back to the OP, will break down the costs below.
CPU Core i7's
920 @ 2.66GHz > $279.99
950 @ 3.06GHz > $569.99
965 @ 3.2GHz > $999.99
975 @ 3.33GHz > $1,024.99
http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=2010340343%201051744913&name=LGA%201366
Since we want to SLi and OC, here are a Few that I would look into below.
X58 Motherboards'
ASUS P6T7 WS Supercomputer $449.99 *
http://www.newegg.com/Product/Product.aspx?Item=N82E16813131390
EVGA E760 CLASSIFIED "Overclocker's Pick" 3-Way SLI $419.99
http://www.newegg.com/Product/Product.aspx?Item=N82E16813188048
Would suggest on 2 kits of below Ram
Ram
CORSAIR DOMINATOR 6GB (3 x 2GB) $179.00 *
http://www.newegg.com/Product/Product.aspx?Item=N82E16820145224
Ram with Fans
CORSAIR DOMINATOR 6GB (3 x 2GB) $209.00 *
http://www.newegg.com/Product/Product.aspx?Item=N82E16820145232
CORSAIR DOMINATOR-GT 6GB (3 x 2GB) $289.00
http://www.newegg.com/Product/Product.aspx?Item=N82E16820145240
G.SKILL Perfect Storm 6GB (3 x 2GB) $259.99
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231258
There will be some new nVidia Cards coming out near the end of June & July, but below is some I would look into.
Graphic Cards
EVGA 01G-P3-1180-AR GeForce GTX 285 $344.99
http://www.newegg.com/Product/Product.aspx?Item=N82E16814130480
EVGA 017-P3-1295-AR CO-OP Edition GeForce GTX 295 $529.99 * (This is one of the new cards and it is already SLi)
http://www.newegg.com/Product/Product.aspx?Item=N82E16814130504
There are 2 more I would like to mention but they have not been released yet. Asus is coming out with them. The GTX 285 Matrix and the GTX 295 Mars (which there will be only 1000 made and it had 4gb ram 1024-bit), they should be out near the end of July.
HDD's
Western Digital Caviar Black WD1001FALS 1TB 7200 RPM 32MB $99.99 *
http://www.newegg.com/Product/Product.aspx?Item=N82E16822136284
You might want to look into an SSD HDD to use for OS drive.
OCZ Summit OCZSSD2-1SUM120G 2.5" 120GB SATA II MLC Internal Solid state disk (SSD) $389.00
http://www.newegg.com/Product/Product.aspx?Item=N82E16820227450
PSU Modular
ENERMAX REVOLUTION85+ ERV1050EWT 1050W $315.99 *
http://www.newegg.com/Product/Product.aspx?Item=N82E16817194039
CORSAIR CMPSU-1000HX 1000W $239.99
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139007
PSU Non-Modular
PC Power & Cooling T12W 1200W $519.99
http://www.newegg.com/Product/Product.aspx?Item=N82E16817703012
Sound Cards
Creative Sound Blaster X-Fi Titanium Fatal1ty Professional $139.99
http://www.newegg.com/Product/Product.aspx?Item=N82E16829102019
AuzenTech AZT-FORTE X-Fi Forte 7.1 Low Profile PCI Express Sound Card $139.99 *
http://www.newegg.com/Product/Product.aspx?Item=N82E16829156010
Auzen X-Fi HomeTheater HD (upcoming release)
http://www.auzentech.com/site/products/x-fi_hometheater_hd.php
Sound Cards with Front Docking Port
Creative Sound Blaster X-Fi Titanium Fatal1ty Champion Series $199.99
http://www.newegg.com/Product/Product.aspx?Item=N82E16829102021
Blu-Ray Drive
PLEXTOR Black 6X BD-ROM 16X DVD-ROM 48X CD-ROM SATA Internal Blu-Ray DVD Combo Super Multi Drive $144.99
http://www.newegg.com/Product/Product.aspx?Item=N82E16827249039
PLEXTOR Black 6X BD-ROM 16X DVD-ROM 48X CD-ROM USB External BD Combo Super Multi Drive $159.99
http://www.newegg.com/Product/Product.aspx?Item=N82E16827249040
Blu-Ray Burners
Pioneer Black 8X BD-R 2X BD-RE 16X DVD+R 5X DVD-RAM 8X BD-ROM 4MB Cache $208.99
http://www.newegg.com/Product/Product.aspx?Item=N82E16827129037
Monitors'
ASUS MK241H Black 24" 2ms HDMI Widescreen LCD Monitor with 1.3M Pixel Webcam $279.99
http://www.newegg.com/Product/Product.aspx?Item=N82E16824236033
ASUS VW266H Black 25.5" 2ms(GTG) HDMI Widescreen LCD Monitor $329.99
http://www.newegg.com/Product/Product.aspx?Item=N82E16824236047
DELL ULTRASHARP 2408WFP $599 (IPS Panel) *
http://accessories.us.dell.com/sna/products/Monitors/productdetail.aspx?c=us&l=en&s=dhs&cs=19&sku=320-6272
Dell UltraSharp 2709W 27-inch WideScreen $689 (IPS Panel) *
http://accessories.us.dell.com/sna/products/Monitors/productdetail.aspx?c=us&l=en&s=dhs&cs=19&sku=223-9379
The above Dell montiors use the best LCD Panels for viewing angles (great for watching HD Movies on).
I am not into Speakers, WebCams or Wireless Keyboards/Mouses, so some one else will have to help you out there.
Would suggest you get the Release Candiate of Windows 7 64-bit OS, you can use it free until around March of 2010, otherwise if you can not wait I would suggest the below OS, mainly it will allow you to use more then 4gb of ram.
Microsoft Windows Vista Home Premium SP1 64-bit for System Builders $99.99
http://www.newegg.com/Product/Product.aspx?Item=N82E16832116488
Aslo this denotes * parts I would seriously look at or buy if it was my build.
Good Luck on your upcoming Build.