To start, there is no reason to spend $700 on the CPU. Instead, grab the I7-930 for a good $400ish less and overclock it. You could use the savings to grab a second 580 for SLI, or stick in a SSD. Check out OCZ's Vertex 2 or Agility 2 SSDs for some good ones. I'd get one that's at least 80 GB or larger.
Second, you don't need a sound card unless you're a huge audiophile. Onboard sound is extremely good now days and is already capable of suppling 7.1 outputs. I would at least try onboard before getting a discrete sound card. If you can tell tha the quality isn't the best, then buy the card. I'd probably suggest going more expensive on it, as the lower end cards aren't going to be much better than onboard.
Third, I'm not a huge fan of the Rampage series of boards. I'd personally switch to the Asus P6X58D Premium. It's cheaper and considered to be a better board overall.
Fourth, that RAM is kind of slow. Pick up some 1600 mhz (or higher) CAS Latency 7 sticks instead. I would rank the different brands in this order: G.Skill, Corsair, Mushkin, followed by everyone else. Just avoid OCZ, as they don't play well with Intel boards.
Fifth, a better HDD is the Samsung Spinpoint F3 1 TB. It's roughly the same price, but it's a touch faster and higher quality.
Sixth, I don't see any reason to spend $250 on a case. You really don't need to spend more than $100-$170 (US). The HAF 922 is considered the best case out there. It's around $100. It's called a mid-tower, but it's actually larger than many full towers. It's kind of ugly though. Other options I'd prefer are the Antec 1200, HAF 932, and the Coolermaster Cosmos. Those all run around $160 US.
Finally, I'd probably step up the PSU to an 850W. Corsair would be great. I'd look at their modular line, since you'll obviously have a lot of money left over after these changes.
You can use your old DVD drive, but I'd probably get a new HDD for the boot drive. The newer drives are a lot faster. The older drive would be just fine for another storage drive.
As for the Corsair H70, that's not a great choice. Corsair's Hydro series isn't that great. It's expensive, yet doesn't cool as well as some of the higher end air cooling options. I'd check out the Scythe Mugen 2 Rev. B (about $40 US) as a great, cheap option or the Noctua NH-D14 (about $90 US) as the absolute best cooler out there.