Speakers have absolutely nothing to do with the overall performance of a system. Also, different people have different needs and they need to fit on different budgets. I don't think you should jump to such conclusions so quickly, especially when it comes to making ridiculous prejudices.
Anyways, to the original poster. Building a computer really isn't very hard once you get a basic understanding of what each part does and what it's needed for. The easiest way to accomplish this is to open up your box right now and see what parts you can pick out off the top of your head.
You can also read your motherboard and other current hardware manuals to get familiar with how to use each part.
When it comes to picking out parts, you needn't worry. Simply determine what you want the computer to be capable of doing, and come up with a budget, and we at TF will pick out hardware to best suit your needs.
Building may seem intimidating at first, but once you start out you'll find it's not difficult at all.
To start off, I suggest you get familiar with terms commonly used, and new technology availible at the moment.