I thought I would reply back and summarize what I ended up with and how my experience went, being a first-timer to build it yourself PCs.
I ended up buying everything through NewEgg, although I found that TigerDirect and a few other sites were very useful for comparison shopping and to get additional details on components. My goal was a computer that has plenty of horsepower for running Office, a few imaging programs (e.g., PhotoShop, AutoCAD), and a couple of recent-ish games (Civilization IV, Lego Star Wars, SFC:OP - of course). I also wanted a build that I could upgrade over the next 6-8 years so that as software advanced, I could incrementally upgrade.
I put the Dell vs. build argument to the test, and I ended up with slightly better components for a slightly (< $100) better price with NewEgg. So, my anecdotal conclusion is that if you know what you're doing and you're willing to put the time in, you can save money and get better stuff if you build yourself. I also did warranty comparison as suggest by Pestalence, and most of the components have solid warrantys on their own, especially if you bother to register with the manufacturer.
With shipping, rebates, etc., I ended up paying about $775 for everything. Note that because I was replacing, I didn't buy monitor, keyboard, printer, etc.
Putting this together was surprisingly easy. I'm not someone who's interested in over-clocking, so I didn't worry myself with extra fans, heat sinks, etc. Given this, the only nerve-wracking part was putting the CPU into the motherboard, but the Zero Insertion Force model works pretty well. Everything else was pretty easy as long as you're familiar with the basics of how motherboards get attached to cases, and then how everything else gets attached to the motherboard.
In summary, given the audience of Dynaverse, I'd suggest that most people at least take a look at build it yourself if you're in the market for a new computer.
Ok, here's the breakout:
Rosewill R604TBLK-N 120mm Fan ATX Mid Tower Computer Case+450W Power Supply - Retail
$54.99
ABIT IX38 Quad GT LGA 775 Intel X38 ATX Intel Motherboard - Retail
$219.99
Intel Core 2 Duo E4500 Allendale 2.2GHz LGA 775 65W Dual-Core Processor Model BX80557E4500 - Retail
$119.99
G.SKILL 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 1066 (PC2 8500) Dual Channel Kit Desktop Memory Model F2-8500CL5D-4GBPK - Retail
$149.99
PNY VCG84R2SXPB GeForce 8400 GS 256MB 64-bit GDDR2 PCI Express 2.0 x16 HDCP Ready Low Profile Video Card - Retail
$44.99
Western Digital Caviar SE16 WD6400AAKS 640GB 7200 RPM SATA 3.0Gb/s Hard Drive - OEM
$109.99
Sony NEC Optiarc 20X DVD±R DVD Burner Black SATA Model AD-7190S - OEM
$26.99
SAMSUNG Black 1.44MB 3.5" Internal Floppy Drive Windows 98SE/ ME/ 2000/ XP - OEM
$6.99
Microsoft Windows XP Home With SP2B 1 Pack - OEM
$89.99