Hey Tree_Hugger, here's a build I put together for you:
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ASUS DRW-24B1ST/BLK/B/AS Black SATA 24X DVD Burner - Bulk - OEM
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NZXT GAMMA Classic Series GAMA-001BK Black Steel ATX Mid Tower Computer Case
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Western Digital Caviar Blue WD5000AAKS 500GB 7200 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive
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EVGA 01G-P3-1371-TR GeForce GTX 460 (Fermi) 1GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card
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Antec High Current Gamer Series HCG-520 520W ATX12V v2.3 / EPS12V v2.91 80 PLUS BRONZE Certified Active PFC Power Supply
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Kingston HyperX Blu 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model KHX1600C9D3B1K2/4GX
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GIGABYTE GA-Z68XP-UD3P LGA 1155 Intel Z68 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard
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Intel Core i3-2100 Sandy Bridge 3.1GHz LGA 1155 65W Dual-Core Desktop Processor BX80623I32100
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Intel 510 Series (Elm Crest) SSDSC2MH120A2K5 2.5" 120GB SATA III MLC Internal Solid State Drive (SSD)
TOTAL:
$1,006.62
It's $100 over your budget, but the only components I'd recommend downgrading are the SSD and motherboard, and both are really tough to upgrade later. If you can deal with the extra cost, I recommend it.
Here's the breakdown:
You've got a capable processor and a great mid-range graphics card (I use the same card for BFBC2 and Mass Effect 2 myself at the highest settings, it ought to handle BF3 capably by itself, an upgrade *might* be needed for max settings).
You have 500GB space on a well-reviewed HDD plus probably the most reliable 120GB SSD on the market: definitely install Windows and your games/apps on this to reap the speed benefits. If you're unfamiliar with solid state drives,
this article at Bit-tech is a good place to start.
You also have a capable 4GB of memory (Kingston probably has the best quality assurance among memory manufacturers, so very reliable), plus a quality power supply unit (very important not to go cheap here). You've got a solid budget case (I've built a system in it myself and can vouch for it) and a well-reviewed motherboard that will support SLI.
Regarding SLI/Crossfire, it might be more cost efficient (and possibly more stable) to stick with a single card and upgrade to the "new" midrange card as new tech comes out in a year or two. It's what I'd do, up to you.
Let me know if you have any questions
Edit: blast, forgot to include a copy of Windows in the price... That's $100 more. If you're uncomfortable with the cost, I can make some adjustments.