Intel Hyper-Threading Technology (whatever that means)
It's a server (usually Xeon) variant CPU's neat property, I wont bother you with the tech details, but it boosts CPU performance by 5-20%. Doesn't work w/ all apps, tho. Your CPU doesn't fully support Hyper-Threading, but it's fast enough w/o it, so don't worry yourself too much with it.
512MB x 1 Kingston PC3200 400Mhz DDR Memory (I have only 1 for later upgrade up to 4 Gig)
You should consider adding another one of the same kind, because then you'll get max memory performance, again 5-20% boost, depending on the task(s) (new P4s and i865 have a memory boost system that works only w/ pairs of identical modules, similar to nVidia/AMD's system)
+ 3 Extra case fans (where do the extra fans go?)
To the front and to the back of your (aluminum) case, the one(s) in the back should evacuate the air, and the one(s) in front should supply the interior w/ fresh air. If you're gonna keep your comp case open (you take one of the side panels off), you wont need those.
(Is this necessary if I have onboard sound? Or should I just reuse my present Sound Blaster Live Value Edition older version?)
Audigy is a masterpiece, but you don't need it. (unless you want to do some serious audio editing, AND you have a $500+ speaker system to attach to it, or some badass headphones, +HIGH QUALITY music, not the 128kbps mp3 crap)
I'd stick with the Live! Value that you already have, just d/l latest drivers, and you're fine.
Sony CDRW 52x24x52 EIDE
I dunno... Maybe if you can find a TEAC W540E 40/12/48 (W/RW/R)... The best CD-ROM type drive ever built... Talking from personal expirience. If not, take a Plextor, or Toshiba, no Sonys, LGs LiteOns, NECs and similar crap... Trust me.
Is this a good buy?
The money/performance ratio is OK, if you wanted an all-round monster machine... If not, you could take something a bit weaker, and leave the extra money for software, badass headphones, drinking...
Happy shopping!
If you have any more q's feel free to ask. I'll do my best not to screw up w/ the answers...