Looking to rebuild, and recycle

My current gaming rig is closing in on two years old. I think it's time for an upgrade!
What I'm looking to do is build upon what I already have, and take the parts I take out of one machine and build a second machine for my mom out of them. So I'll list both sets of specs, and take suggestions at where I should go.

New System:
Antec 900 case
OCZ GameXStream OCZ600GXSSLI 600W ATX12V SLI Certified CrossFire Ready Active PFC Power Supply

Intel i5 750 CPU - 200 on newegg
Windows 7 Home Premium 64 - 100 on newegg
Hyper 212 Plus Cooling Fan - 35 on newegg
1TB Harddrive - figure any of them are good to go

Having problems figuring out which MoBo to go with, which type of RAM works best (figure 4GB is a good idea), and which video card to go with. I'm currently using a Sapphire Radeon HD 4850, and I was thinking about maying going X-Fire with it, but I've read some reviews on the card with people saying it went out on them. I've definetely noticed some slowdown on it after long periods of play time, but not the kind of problems some people were having with it. Trying to figure if it's worth it to get a D11 card instead. Also, if I need a bigger/better power supply.

Rebuilt System:
With this one, I'm just trying to gauge what kind of power supply I should get with it. I'm looking for something cheap, but won't crap out.
Intel Core 2 Duo E8500 Wolfdale 3.16GHz
ASUS P5Q Pro LGA 775 Intel P45 ATX Intel Motherboard
Mushkin Enhanced Blackline 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400)
SAPPHIRE 100245L Radeon HD 4850 512MB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready CrossFireX Support Video Card
wiping a 640GB hd that's currently in use with this system, and reinstalling Vista-64

And my mom picked the AZZA Solano Case for herself.

Total, I'm only looking to spend 6-800 on upgrades/replacements, will probably buy from newegg or tigerdirect, and live in the US. Both systems already have monitors, keyboards, mouses, use on-board sound, etc. I might overclock the new system (if i can figure out how properly), and don't know about x-fire'ing. Depends on the video cards.

Thanks for any help!
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More about looking rebuild recycle
  1. I would get the latest AMD socket with a best buy quad like the Phenom II X4 955 Black Edition C3 stepping. Then you will be able to move to new X6 CPU's in the future.

    AMD Phenom II X4 955 Black Edition Deneb 3.2GHz
    RAM A-Data 1600
    SAMSUNG Spinpoint F3 HD103SJ 1TB
    Video card
    HIS H577FM1GD Radeon HD 5770 1GB

    With the cooler and the OS that's $736.

    For the PSU you can go with the CORSAIR CMPSU-550VX, Antec TruePower New TP-550 550W (modular), SeaSonic S12II 620 Bronze 620W, CORSAIR CMPSU-650TX, Antec TruePower New TP-650 650W (modular).
  2. Total budget: $600-$800. Assumption: Your mother's computer will only be used for Internet browsing, photo editing, office applications (Microsoft Word), etc. (Read: No Gaming)

    Your system/Her system:

    Case: Antec 900/Azza Solano

    Cost: $100 - $20 (Free shipping)

    Case Fans: No extra needed

    PSU: Corsair 750w TX/OCZ 600w

    Cost: $110 - $20 (Free shipping)

    Hard Drive: Seagate 1 TB/640 GB

    Cost: $85 (Free shipping)

    Ram: G Skill 4 GB DDR3 1600/Mushkin 4 GB DDR2
    Cost: $110 (Free shipping)

    DVD drives: HP DVD Burner/Reuse (Assumption: Only 1 drive in old system)
    Cost: $30 (Free shipping) (Retail versus OEM for the legal copy of Nero)

    MB: (If want the ability to Crossfire) Asus 790X/Reuse
    Cost: $120 - $10 (Free shipping)

    MB: (If ok without Crossfire capability) Gigabyte 770/Reuse
    Cost: $90 - $10 (Free shipping)

    CPU: AMD Athlon 2 x4 640/Intel Core 2 Duo e8500
    Cost: $99 (Free shipping)

    Subtotal: ($534 + MB cost of $120 or $90) - ($50 Mail-In Rebates) = $654 Maximum Pre-Rebate

    GFX: XFX 5770 1GB/Sapphire 4850 512 MB
    Cost: $160 (Free shipping) (Reason: I like XFX's lifetime warranties versus 2-3 warranties of other manufacturers.)

    CPU Cooler: Sunbeam Core Contact Freezer/"Unknown"
    Cost: $40 - $15 (Free shipping)

    Total: $654 + $200 = $854 - ($65 Mail-In Rebate) = $789

    Overall: You, truly, are not going to see much difference between your new computer and your old one. However, you will be getting...
    1. 2 extra physical cores in your CPU for multi-tasking. Plus, the ability to upgrade to a new CPU later in the system's life.
    2. Ability to upgrade your ram with 2 more 2 GB sticks later in life.
    3. Add an extra 5770 in Crossfire later in life, plus the upgrade to DX 11 now.
    4. A bit more hard disk space.
    5. Your mother's computer will be gaming capable on your old graphics card.
    6. This does not include the cost of the Operating System(s).
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