Smiss> While I can't help with the terminology if I don't know where you're confused, I can help with some recommendations.
I would go with an AMD-based machine before I went near a P4. Performance is still lagging with the P4 since there aren't many optimized applications written for it just yet, and it's a dog in performance with non-optimized applications.
In addition, you're currently bound to RAMBUS with the P4 which, aside from being ridiculously expensive, has the technical dilema of having a ton of bandwidth being held back by high latency.
With either a Thunderbird or Duron, you have the choice of either SDRAM or DDR. The CPU costs less, the memory costs less, and at the same clock speed, they're usually faster than a P4.
I would tend to think that, unless you're playing 3D games with very high power requirements, doing software development, or rendering 3D images or video, you may not realize that a Duron will be more than fast enough for your needs and will cost you a fraction of what a T-bird costs you. And a year down the road, if you need a CPU upgrade, you can probably just pop in the T-bird you need, if they're still around then.
The motherboard you would select depends on your needs. Do you just need a simple, stable board with no bells and whistles, or do you need a board with features handy for overclockers?
What motherboard you choose will determine what kind of RAM you need. If you can, I would go for a board that supports DDR, since it's faster for about the same price as SDRAM, and it seems to be the direction the industry is heading in.
As for your video and sound card, it only depends on what kind of card they are. Chances are that, if you have a relatively recent video card, it's either PCI or AGP, and you shouldn't have a problem with either. The sound card depends on whether it's ISA or PCI. If it's PCI, you're in the clear. If it's ISA, you may have to change your motherboard choice, or upgrade to a PCI sound card. ISA is being phased out across the industry, so motherboards are coming with fewer and fewer ISA slots, sometimes not including them at all.
If you have any questions about the above, or if I've raised new questions, let me know. I tend to get more technical than I should sometimes.
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