Well, I'll tell you what I know. I bought one a couple weeks ago, for about the same price. This post is mostly to warn people that the FAQ is a bit overenthusiastic, IMO. I'm not saying the rig isn't a good deal, I'm saying there are things you may want to consider, that I didn't know before I bought mine.
The HD that came with mine was a 40GB Western Digital, 2MB cache. Lower end than the FAQ implies.
The case absolutely bites, IMO. It does the job, but I can't believe these guys who estimate it at 100 bucks. If the motherboard had standard fittings, I'd swap it into a $30 case. The case is built like a briefcase that only opens about 75%. You can't just take a side panel off to look at something, you have to turn it off, lay it on its side, and creak open the case (mine is really stiff) at the hinge. You can't separate the halves, you can't even get them 90% open, which makes it very hard to work on - not much elbow room, and hard to get a light to shine where you want it. To be fair, it's the memory and drives that are harder to get to than in most cases; the PCI slots are OK.
Another thing about the case - only two free drive bays (a five and a three), and no place to mount extra fans. I know, as cheap as big drives are, the bays shouldn't be a problem, just stick a couple 250's in it. But I had three smaller drives I expected a "server" could hold, that I won't have room for.
The power supply does seem good for a 250W - mine is running a GX6800 just fine. My beef with it is that it only has the one fan in back, and since you can't mount any more fans in the case, it would be nice to have a PS that has an intake fan on the bottom. I happen to have a nice Enermax that I would love to swap in, but it has this weird gizmo on the back, namely an on-off switch. The Dell PS doesn't have a switch, and the case doesn't have a hole for one, so you need to do some sheet metal work to make most power supplies fit. Bummer.
Speaking of switches, the Dell also doesn't have a hardware reset switch. No on-off, no reset, so if your OS ever freezes, you have to unplug the damn thing.
Another big disappointment is the BIOS setup. As barebones as you can imagine. Zero OC potential, and pretty limited options all around. In particular, it DOES NOT boot from a USB drive like the FAQ says. The BIOS boot menu has an option for USB, but only a Flash device. Even my 3-year old PC I'm upgrading from boots from my USB enclosure.
Also, the MB is NOT a standard Intel 875P. It's similar, but it lacks some functionality, e.g. 5.1 sound. You need to get a sound card if you want to hear the monsters behind you. Again, my 3-year old (Nforce) MB had 5.1, and it was only $75, so it just didn't occur to me that the 2004 models wouldn't have it.
On the positive side, the Dell is VERY quiet. Even with my 6800 card (yes, the AGP slot works perfectly), it is barely audible for normal stuff. Crank up Doom3 or Chessmaster, and the CPU temp goes up about 30 degrees, and the fans start to whine, but even at its loudest it's quieter than my old PC (but my old PC had a lot of extra fans in the case, so it ran a lot cooler).
Oops, an exception to the quiet -- the CD drive is the loudest I ever heard. Somebody else said it sounded like a plane taking off, and I think that's pretty close. Strange, because it's a Lite-On, and I have a Lite-On burner that isn't a third that loud.
So would I buy one again? I have to say no. It's a nice PC, but not what I thought I was getting. I don't know if I could build the base model for the same price, but I damn sure could build what I wanted for cheaper than the final cost of my Dell, because I have to buy a bigger drive and a sound card to make this useful, which I wouldn't have to do if I had gotten my choice of even a low-end MB and case. Not to mention I'm paying for a drive, video card, CD drive, and memory that I'll probably never use. Yeah, I could get a few bucks on Ebay, but it's not worth the hassle, so I'll just keep the takeoffs on the shelf for spares, and most likely never use them.
The parts I'm not throwing away still aren't what I really want, because the board doesn't have 5.1 sound, it won't boot from my external USB enclosures, and the case sucks.
On the other hand, the CPU works great .
If you are only going to use this for office apps, then the included memory, sound, video, and CD drive should be fine, and you've got a good deal (in the sense of shooting flies with a cannon). If you agree with the people who think clamshell cases are great, and you're an audiophile who would buy a sound card even if the onboard audio was 5.1, then maybe this is a great deal for you anyway.
Everything above is based on my personal preference, every sentence assumes YMMV, and I'm not going to argue with anyone who thinks I'm full of crap. I just wanted to give a review of my experience.