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With due respect, everyone I know in the IT world has built their own computer and it's not really that big of a deal that I'd want to read about someone else doing it. I think it's a great experience, but it's not monumental like, say, building your own OS.
My experience is that building your own computer doesn't save you any money for two reasons, 1) because you'll end up buying name brand parts, unlike the generic stuff used in OEM models, and 2) because you'll buy good stuff that you might not otherwise because often comes with OEM models, such as an optical mouse. Not to mention, even hardware warranty doesn't come close to comparing to a Dell warranty plan.
I know when I built my last computer, it was as follows:
AMD Athlon XP 1700+
MSI K7T266A motherboard (with onboard RAID controller)
(2) IBM 40 GB 7200RPM HDs (at RAID 0)
512 MB Crucual DDR SDRAM
12X8X40 Lite-On CDRW
3-Com 10/100 NIC
32 mb nVidia GeForce2 GTS vid card
100 MB internal zip drive
Creative SB Audigy soundcard
Microsoft Optical wheel mouse
Logitech 5.1 THX 300W speakers
250 w power supply w/ ATX mid-tower case
I spent way more than I needed to. It was nice to have built a computer from scratch, but now I've done it about 10 times, and I'm okay with buying vanilla models off a website. Every true techie should have done this at least once, if only because you learn a lot and you'll lose all nerves about cracking any case open.