Gaming PC

I am putting together a new gamming PC, I have had a post before that
was very helpful. I now have almost all my parts that I need to order,
just ran into one problem...

I am currently planning on buying the following items

Processor: AMD Athlonx2 Windsor 2.6ghz 5000+ Model # AD05000CZBOX
Motherboard: Fatal1ty AN9 32x
Memory: Crucial 4gb kit
Hard Drive:.... I have been told a WD 74gb Raptor 10k RPM, but i have
also heard that its load and has problems, I have also been told to go
with the Seagate Barracuda 7200.10, but have been told its gets really
hot and is noisy... Need some help there...
PSU: Rosewill 600Watt Model # RP600V2
Case: Antec Solo


Any suggestions to these would be very helpful and I would very
grateful for help. And a lot of people are telling me why go with 4gb
kit? becuase my motherbaord supports 8gb.. So why spend half the money
for just 2gb sticks, when i can get half all at once, i would be
getting a crappy deal if i went and bought 2 2gb sticks at different
times... So thats the reason for that, and if anything else isnt
right, please let me know Thanks a million every1

Zac