Please help a newbie

I am fairly new at the multi-media aspest of computing. I have a sound blaster live value and am currently in the process of buying a Radeaon 64 Vivo and Pioneer DVD-ROM 106S. I currently have a 2.1 speaker(logitech) and am thininking about an overhall in the sound department. I was looking at VideoLogic DigiTheatre DTS and really like the rave I hear about it, however, its $600 price range is somewhat out of mine. Reallistically, I was thinking of MidiLand 7100 plus which I belive comes with it's own 5.1 decoder. It's $230 price is much more to my liking, but I have not heard as much good things about it as Videologic.
I was wondering if anyone here has any experiences with either of these speaker systems, or if anyone can suggest something that they liked better in the $250-$300 price range.
Also, do I need to upgrade my SB live value to one of it's 5.1 siblings or would I be ok as long as the speaker systems have some kind of 5.1 decoder...

Thank you for your help.