Nitin,
A good quality Amp should pass along really good clean power to your speakers. Harmonically, there should be very little to no difference between them. PDawg can attest to this. He's had several different Amps and I believe I've heard him say that he could hear no difference between them..
I'm a big fan so far of Emotiva. I think for the money, the build quality and features make them very nice Amps. For the money, to get balanced and unbalanced inputs, the specs they have and 12v triggers, they are really nice products. Especially for the price.