Which power supply for this gaming comp build?

Hi there , it's really nice to part of your community, nice to meet you all Currently, I'm building a new gaming comp but it terms of the power supply for this SLI configuration, its out of my league so I'm hoping to get some tips from the experts I checked www.bfgtech.com/slipower for a dual Nvidia GTX 260 power supply recommendation and they suggest: Antec Signature SG850 850W ATX12V / EPS12V SLI Certified CrossFire Ready 80 PLUS Certified Modular Active PFC Power Supply – Retail http://www.newegg.com/Product/Prod [...] 6817371018
Although the specs for the card shown in newegg requires me to have 38A at 12v. I'm not a pro when it comes to power, volts, or wattage requirements so I'm concerned this power supply won't be sufficient for this build. The GTX 260 has a higher mhz (655MHz vs. 576MHz standard) and memory clock (2250MHz vs. 1998MHz standard), and I am planning to over clock them. Is the Antec SG850 850W good enough or should I be looking into another power supply with higher watts, what would you suggest I get if the Antec is insufficient? Thank you so much. Comp Spec:
Motherboard
ASUS Striker II Formula LGA 775 NVIDIA nForce 780i SLI ATX Intel Motherboard
CPU
Intel Core 2 Quad Q6600 Kentsfield 2.4GHz 2 x 4MB L2 Cache LGA 775 Quad-Core Processor
Ram x 2 so 4 gb total
OCZ SLI-Ready Edition 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 1066 (PC2 8500) Dual Channel Kit Desktop Memory
Video Card x 2 for SLI
BFG Tech BFGEGTX260MC896OCXE GeForce GTX 260 896MB 448-bit GDDR3 PCI Express 2.0 x16 HDCP Ready SLI Supported Video Card
Link: http://www.newegg.com/Product/Prod [...] 6814143157
Sound Card
Creative Sound Blaster X-Fi Titanium Fatal1ty Professional 70SB088600002 7.1 Channels 24-bit 96KHz PCI Express Interface Sound Card
Hard Drive x 2 for Raid 0
Seagate Barracuda 7200.11 ST3500320AS 500GB 7200 RPM 32MB Cache SATA 3.0Gb/s Hard Drive
DvD Burner
ASUS Black 20X DVD+R 8X DVD+RW 8X DVD+R DL 20X DVD-R 6X DVD-RW 14X DVD-RAM 16X DVD-ROM 48X CD-R 32X CD-RW 48X CD-ROM 2MB Cache SATA 20X DVD±R DVD Burner

nVidia certified two 750W PSUs for dual GTX 260. (one is Amacrox, one is ATNG).
http://www.slizone.com/object/slizone_build_psu.html
They did not certify the Corsair 750TX or the Silencer 750W, but I'm sure they would do as well. They are $100 or $110 at newegg these days, not $200 like the Antec Signature.

Also, if you want to spend $200, you could get the Corsair 1000HX for the same price.
http://www.newegg.com/Product/Prod [...] Tpk=1000HX



I'd drop the sound card and use the savings to upgrade to Q9550.

WoW, really learned a lot from you guys, thank you so much for the help and suggestion, now it's time to do a little extra research and thinking, thanks again =)