-8 gigabyte ram is a bit excessive, and it doesn't say what the mhz is. I've never gone over 2.5GB of RAM usage unless I'm running Photo Shop and some other heavy duty stuff all together. I would go for a higher mhz ram with less GB's. Kingston are a well-known ram producer that make good RAM sticks, they have 2133 mhz 2GB sticks for cheap (relatively cheap, considering how much this PC will cost you) You could buy 2GB of it, or 4GB if think you need more. Kingston (2x2) 4GB DDR3 2133mhz RAM.

-Hard-Drive is fine, although you may want a secondary hard-drive. Hard-drives are cheap, probably the cheapest part of your PC.

-DVD-RW is fine.

-With the Sound Card, what games are you planning to play? Because with a game like Call of Duty 4, it is essential to have a good sound card so you can hear footsteps, with my old PC, in a 1 on 1, I could pinpoint my enemy exactly on the map, even if I was on the other side of it. But if you're just planning to watch some HD movies and play WC3, you should probably be able to use the Gigabyte built-in soundcard.

-Windows 7 Home Premium is okay, but it is a little short of features compared to Windows 7 Ultimate/Premium.

-Monitor is fine.

-You will also need a good PSU, probably 750W from Corsair of XFX, else your system may run out of power.

-Also, once you've built your PC, try to put it in strain for 12 hours, and see if you find any problems. This is a stress test and should always be done when you have finished building your bespoke PC, to find any problems in it. If you find any, come and tell me or ask the manufacturer of the part.

-This is still a mighty fine PC, it will still be "high performing", but not a Super PC :P. If you want to go crazy with it, you could get:

-4x GTX480 eVGA in SLI.

-12 GB Kingston Hypex RAM.

-Intel Core i7 990X Six Core 3.4GHz 12GB Cache (12 Threads)

-Then that would be a Super PC :P.