Dumb question but do you need any particular speakers for a 5.1 setup? I currently have a pair of Pioneer S-HF10's and a Kenwood SW-301 sub. Will these work?
Good - 3 of the same for the L/R/C, 2 surrounds, sub
Shoddy - A mix of old and new speakers from different places, no sub, 2 head VCR and a 19" Magnavox.
But really, a speaker is a speaker, and you need 5 plus a sub. If you like the way it sounds, all the better. But 5 of the same will ensure that the "soundfield" will be like a bubble of sonic virtual reality.