I'm going to be getting 2 3-way speakers. One option is the 200 watt Sony
3-ways. If I do this I can afford to either get the Sony 4 channel amplifier
(2 x 80 watts RMS, bridged) or a Sansui 840 watt 4 channel amplifier (2 x
420 watts peak, no idea about RMS, bridged of course). Which of these
amplifiers would be a better deal?

Now, if going for the Sony speakers is a bad idea, my other option is
Kenwood 6 inch 150 watt 3-watts. Unfortunately, these cost a little more and
would require that I get a cheaper amplifier, specifically, an Altec 500
watt 4 channel amp (2x 250 watts peak, no idea about RMS, bridged of
course). Should I avoid Sony speakers and go this way?

In case you were wondering, I'm only looking at 4 channel amps because I may
add a sub at some point.