Case: If you're not doing overclocking, you don't really need the lian case. You can get an Antec SX840 or SX1040 w/ 400W antec PWR SUPPLY for about $135 shipped.
CPU: Athlon XP 1900+??? They aren't even out yet. Granted that they might be out by christmas, but even if they are, they will be a sh!tload of $$$. I'd get the 1800+ XP if I we're you. By christmas it will easily be under $200.
Motherboard: This is a good choice, even though it will probably be about twice as much as the Shuttle kt266a board, and you probably won't gain alot from it... but if you gotta the the absolute best of something, it mine as well be the motherboard!
Memory: No point in getting corsair unless your heavily overclocking. Why not get some PC2700 DDRAM?? I see them starting to come out, they we're listed at pricewatch, and they are only $50 each (for 256mb).
Keyboard: I've always had it in my mind that "a keyboard, is a keyboard". I buy generic keyboards for $6.99 from my local store, and they kick @$$, not the mouse on the other hand... [read next line]
Mouse: great choice! heh. May I suggest an optical mouse instead? The Microsoft Intelli-Mouse Optical is great. I personally have a logitech optical, but I would rather have a microsoft, even though logitech kicks ass.
Monitor: Not many comments here, good choice, nice monitor.
Video Card: No need for a GeForce3 Ti-500. Trust me dude, you will notice virtually no difference (like what, %6?) between the Ti-500 and Ti-200 except the price!!! In most games. Get the ti-200 and overclock it.
Sound Card: Good sound card, good choice. Money well spent.
CD/RW: Ewww, plextor. Why don't you just buy a Lite-On, scrap the name off the front of it, and buy a sticker that says "Plextor" on it. After all, your paying for a name arent you? Lite-On kicks major ass, my next purchase is gonna be a Lite-On 16x10x40 CD/RW and then a 16x Lite-On DVD. Get the Lite-On, unless you REALLY like the name "Plextor".
DVD: Good choice, gotta love slot-loads!!! Now where is the matching slot-load CD/RW???
Dial Up: Why do you need the best modem? A US Robotics? You won't notice much difference between it and a cable modem, besides, something tells me you wont be using it... your computer kicks too much ass to have a crappy 56k modem on it. Dont buy it, wasted money.
Cable: Not much comments on this one, I dont know much about cable modems.... I own a "terayon" modem that my cable company gave me for free, and it kicks ass.
Ethernet Card: No comment
Floppy Drive: If I commented on this, I would need help... LOL
Speakers: This one really got to me (calm down acid). $300 for speakers!!!??? What are you running, a fricking studio? This is wasted money in my opinion. Get a 5-peice system for like, $75 or something, no need to spend $290 on it.
OS: What can I say? Go XP!
Looking over your stuff it seems like your just trying to buy the best. Just remember, the most expensive doesnt always mean the best. When your cutting $250 off the price, get rid of the little things you dont need, like the "Plextor" name and the hella expensive "Speakers". Also... sorry if my comments were a bit annoying, but damn boy, I will never own $300 speakers LOL.
GOOD LUCK,
Acid