Yup, either power supply here should easily work with a GeForce 7900GTX. Those cards typically require a 400W power supply, with a sustained 26A at 12V (BFG 7900GTX OC).
The Mushkin has 2x 12V rails rated at 20A each, and can automatically combine them for a total of 40A.
PFC in a power supply is Power Factor Correction. An explanation into this gets a bit complicated, but basically a power supply with PFC is more efficient than a power supply without, especially at lower power draws. Depending how your power company charges you this can save you money. PFC comes in either Active or Passive...nearly all power supplies have at least passive, but active is better, and costs you more.
As for compatibility, your case seems to be plenty large enough to physically accomodate the power supply. Your motherboard uses the new 24pin ATX standard, which this power supply has, it has SATA connectors, PCI-E connectors for the video card(s), the 4-pin CPU power connector, and all the other standard connectors found in pretty much any computer, so it's pretty safe to say its compatible.
edit: I didnt notice which PFC the Mushkin power supply has, active or passive.
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