The 80 gig hard drive that he listed on there for $53...You can get better for cheaper. On Sunday...or maybe Monday at Staples...they are having a sell.
200 GB hard drive for $39.99. It's normaly $119.99 but $40 instant savings and then a $40 dollar mail-in rebate. So yes, it will cost you 79.99 at first..but you'll get 40 back. Much bigger, cheaper and better.
Same goes for you memory..to save a bit. It's PC3200..512 DDR400 for 39.99 a stick. He has listed PC4000 for you. I'm not sure it's worth it to go PC4000. Your motherboard is designed for PC3200 so I would stick with that. It's backwards compatible only so you'll actually probably hurt performance