Hello Mani,
There are great budget bipole speakers. I am using them from couple of months now (got them for $50) and I am satisfied with them.
But if you have budget then I will suggest you go for speakers with high sensitivity like Klipsch-RP 402. Cause they will give you more output even at low power.
Surround sound is the sound coming from the activities which we can't see on the screen and therefore it should be dispersed rather than focused. Bipolar speakers are meant do exactly that.
I do agree they sound better in dedicated theatre room but it is true for every speaker not just bipole.