Hi Jerry, welcome to the forums. The first thing I say is drop the Ethernet card. You don't need one, the mobo comes built in with 1Gb/s ethernet.
Also, I would try and get a slightly better mobo, one that supports crossfire/SLI. Gigabyte has a good one bundled with the 2400. (can't link right now)
Only other issue is the power supply. Coolermaster doesn't make the top tier power supplies, and those are something you don't wanna skimp on. Check out a 500-650w from XFX, Corsair, Antec, Silverstone, and Seasonic.
And no worries, PCI-E 2.1 is totally compatible.
Last thing. What skin is that on windows? Is that a custom skin, or one that comes with ultimate? Never seen it before...
Ahh, excellent. Might I ask then what your budget is? If you can stretch $50, a 6950 or 560 Ti graphics card would be worth the upgrade. Also, might consider the 2500k. Only $35 more, and can be overclocked to insane levels.
Well I suppose it depends. In my house, I can route the Ethernet wherever I want via a switchbox built into the wall. But you may not have that capability.
Now the link is broken to the card, so might I ask was it a WIRELESS ethernet card? if so, then yes pick one up.
But remember, A wired connection will always be faster than wireless.