Hi Gramberto.
I'll just answer the questions - no stuff you don't need to know
1) AM2 is AMD's new chip...it supports DDR2. If you only upgrade
RAM...you will want AM2
2) Individual computer shops will supply this information with the prices. AMD only have socket 939
CPU's fit into socket 939 motherboards, this will be the same for AM2
3) It will work in a socket 939, but not an AM2 board. It's only DDR1
4) IDE is still available for CD drives and older hard drives. They won't be removing this anytime soon. It is a bit slower however then the newer SATA and SATA2 hard drives.
5) You'll have to get this one from someone who's not in australia

but from what i understand, tigerdirect is pretty good. But you may want to rethink the "service" purely if you need to replace something on warranty.
6) Again, the individual shop will tell you this, once you select the shop and
CPU, post it again and i'll have a quick look to find intergrated video cards for you.
7) Asus, is a good solid cheap brand. The shops will be the ones to do the
CPU/Motherboar combos.
Hope this helps, and if you have any other questions please do ask
