I'd say that machine is far more than you need to play those games, but there's nothing wrong with that if you're happy spending the money and it does mean that when you decide to try another game for a while, you'll be able to run it.
I'd question the value of putting 2 SSDs in RAID 0. I'd go for one single, larger SSD and possibly use it as a cache with the storage drive (Z68 chipset allows this). It's down to preference though. The cooler is good, just make sure you want water in your case - if it leaks it may very well wreck everything, and the i5-2500K isn't a hot chip even when over-clocked. A good air-cooler will do the job and cost about half the amount.
Generally, it's best to get the most powerful single graphics card you can afford and SLI later on. Whether you want to SLI or not is another question...and with a 580, I doubt you'll need to for a while. If it's an option, you may want to get a 1kW PSU just to make sure you have enough power later on.
^ Agree. 1 SSD would perform better than 2 SSD, read write speeds get faster with capacity. Corsair water coolers are good but the stock fans are very very loud. If you want to get it, I would suggest buying other fans to replace the stock fans.
I would not worry too much on getting an ssd(they are quite expensive as of right now) since you will be playing those types of games. I would personally spend half on the components you wish to get, and half on peripherals such as new monitor, keyboard, speakers, mouse, etc. . This would ensure you get the full value of entertainment on your system.
Dude seriously, get a 120gb or higher ssd, I reccomend an Intel 510, just because they are so reliable, and don't listen to the nay-sayers, an ssd is the single best upgrade you can possibly give your machine, I can never go back to snail pace hard drives, unless for media storage. Trust me, whoever recommends against a SSD , obviously does not own one, or has owned a faulty one. Think about it, would you trade your Ferrari, for a 1960's beetle? I don't think so.
Stay away from that level 10 case, your temps are gonna be off the roof.
The GPU is fine, just means you won't have to upgrade it for the next 2-3 years.