Hey mate.
Can you find out the make and model of your motherboard? If it is only taking 667MHz of RAM then it sounds like it might be DDR2 RAM. If we know the motherboard then we can try and max out what it can take or better yet upgrade.
The cheapest 1TB I have seen is $69 from PC Case Gear.
Let me know your mobo and we can look at the right RAM for it.
Hard drive you can go for something like this:
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http://www.pccasegear.com/index.php?...ducts_id=21231
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http://www.pccasegear.com/index.php?...ducts_id=19747
Stick with WD or Seagate. If you want better performing drives then you can spend a bit more. However I highly recommend getting an SSD to install Windows on then get a 1TB or 2TB HDD for your storage.