Klipsch Computer Speakers

Okay, my laptop just crashed and it was a bit outdated anyway (bought 2 and a half years ago), and now I am gonna give a shot at building my own computer. Please help!

Okay so I have a budget of:

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1200$
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As of right now, I have these, so you can exclude this from the 1200$ budget:
LCD Screen: 32 inch LG HDTV HDMI compatible
Mouse: Logitech g5
Speakers: Klipsch THX

Now, I am gonna need some help on the parts. I was thinking of having:
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Processor:AMD Phenom II X4 965 Black Edition Deneb 3.4GHz 4 x 512KB L2 Cache 6MB L3 Cache Socket AM3 140W Quad-Core Processor – 245$; http://www.newegg.com/Product/Product.aspx?Item=N82E16819103692
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Motherboard:ASUS Crosshair III Formula AM3 AMD 790FX ATX AMD Motherboard – 199.99$; http://www.newegg.com/Product/Product.aspx?Item=N82E16813131392
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Graphics card: SAPPHIRE Vapor-X 100269VXLE Radeon HD 4890 1GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card – 174.99$; http://www.newegg.com/Product/Product.aspx?Item=N82E16814102848
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Hardrive: Western Digital Caviar Black WD7501AALS 750GB 7200 RPM 32MB Cache SATA 3.0Gb/s 3.5" Hard Drive – 69.99$; http://www.newegg.com/Product/Product.aspx?Item=N82E16822136283
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Memory: I need HELP here, what could i get to make it compatible with the above hardware?! DDR3 im pretty sure.. but which one, need help picking
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Sound Card: SIIG LP-000022-S1 5.1 Channels 24-bit 96KHz PCI Interface Low Profile Sound Card – 37.99$; http://www.newegg.com/Product/Product.aspx?Item=N82E16829270005
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CD-Rom: HP Black 24X DVD+R 8X DVD+RW 12X DVD+R DL 12X DVD-RAM 16X DVD-ROM 48X CD-R 32X CD-RW 48X CD-ROM SATA 24X Multiformat DVD Writer – 31.99$; http://www.newegg.com/Product/Product.aspx?Item=N82E16827140042
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Case: http://www.newegg.com/Product/Product.aspx?Item=N82E16811129021 – 119.99$
Power Supply: http://www.newegg.com/Product/Product.aspx?Item=N82E16817139005 – 69.99$
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This leave 250$ for the RAM section and any other thing you think I should have in here.

Your specs look fantastic.

Yes, you need any decent DD3 memory. It will scream regardless.

Did you check out this case? I absolutely love it and using one now and will buy another soon. http://www.newegg.com/Product/Product.aspx?Item=N82E16811133086 Excellent reviews too.

Did you want to play Blu-Ray DVDs maybe? You might want to think about that with your video card and player. Also, they’re making some very nice external drives these days too.

Make sure you got plenty of cooling and an excellent heatsink and fan. I always bump-up from the include cpu fan to something much better. Never go cheap on your cooling protection.

Have fun!