bi-amp or not ot bi-amp?

i have a pair of infinity renaissance 90's, and i am ready to buy some equipment. not going to say any brand names to keep that discussion out of the loop, but would like some feedback on what you all think about bi-amp compaired to a single amp? the amps i am looking at are almost exactly the same in either bi-amp or a single amp set up as far as power. also what is your input on bi-wiring? i have heard too many stories that go either way. so what have you all done with your bi-ampable speakers? thanks for any input!