Altec is a good brand of speakers and I have no hesitation in saying GO FOR IT.
Buying computer speakers is not the same as buying speakers for the hifi. When you buy hifi speakers you do have the option of auditioning them, this option is not really available when it comes to computer speakers.
The other important thing to consider is the sound card. If you have a good sound card, it will do full justice to the speakers you get. If you have a very ordinary sound card, I am afraid the the investment in more expesive or higher end speakers would not be justified.
Which sound card you have installed in your system?
I have the Audigy installed in my system and prior to that I was using the SB LIVE. My system is comprising of a NAD amp and Mission speakers. I could never get full satisfaction from the normal computer speakers. So I use this orthodox way of achieving the synergy.
If you like you can check out my article I wrote for a website sometime back to get the idea. Go........
here
If you have more questions, feel free to ask.