Haydosrulz, well you have changed the game now, not that I mind. The Intel Core2 architecture is powerful, competitively priced and, with a 45nm fab process, runs cool and uses less power.
* CPU -- good clock speed, 45nm -- this will be *much* cooler than the Athlon
* Motherboard -- this is a step up with even better specs than the previous one. Note that the second PCI-E slot is x4, not x16.
* GPU -- wow! This is really a step up. The Radeon HD 4850 is a very powerful GPU and with 1 GB of it's own memory, it won't slow you down. Good for gaming.
* Memory -- Kingston is also a good name, maybe CL5 is good and I'm just out of touch.
* HDD -- WD Caviar I have experience with. They are noisy and no speed demons. A Seagate Barracuda is no faster, but makes less noise. The Samsung Spinpoint may have been a better choice, but I still don't have first-hand experience with Samsungs.
* DVD-RW -- still can't go wrong with a name brand drive.
* CPU Cooler -- the Intel retail CPUs come with a stock cooler that is good enough, if you are not overclocking. Also, since we are talking about cooling a 45nm CPU, heat is no longer a concern as it was with the Athlon.
* Case -- I'm still not liking the Titan. One thing that I noticed is it says "server" case, whatever that means. Take a look at the Antec three, nine, and twelve hundred. The Nine Hundred would be ideal for this build having plenty of cooling, but not too much. Of course, it doesn't come with a built-in power supply.
You don't need an audio card because that motherboard comes with a Realtek HD Audio chip that can handle up to 7.1 channels of sound.