ANOTHER one of these thread, so I will try to keep it short and sweet. Going to pull the trigger on this one probably this evening. I'd like to make sure I'm not getting anything majorly wrong and that I'm on the right track. I do plan to OC this. Anyway, here goes:
I personally wouldn't do RAID-0, but that's just me.
If you get the Retail version of your DVD drive, it will include all the software you need, including a decoder to watch movies with it.
The idea of lapping a CPU makes me really nervous. But, to stick to your question, there's nothing wrong with this build. You could probably get cheaper RAM, but it might not oc as high as it appears you may be planning to go.
You probably don't need a sound card, that mobo has good onboard audio.
If you get 4GB make sure it's 2x2GB and not 4x1GB, it's better for future upgrades and you also avoid some problems that seem to happen often with Asus 680i boards when you use 4x1GB sticks.
The P182 is a great case, just not sure if it's got the room and airflow to handle an overclocked CPU and an overclocked 8800 GTX. The card will fit but it will be tight and that restricts airflow. Maybe an Antec 900 or Thermaltake Armor?
I've just received my P182 and according to Antec an 8800GTX will fit if you remove the upper harddrive cage. That is also the same space you have to fit an extra 120mm fan that will be blowing straight at the GPU(s), so I think it should stay nice and cool (as far as a GTX can ever be considered "cool")
The PSU doesn't contribute any heat since it's in it's own compartment and the CPU has got 2 fans pulling hot air away from it (back and top) so it should all work fine.....