Thanks Grunthos.
I had a chance to audition only 2 amplifiers with the V4i, and following were my observations.
1. With Marantz PM5004:
The sound was 'warm', but slightly leaning towards 'dark'.
Male vocals were good.
2. With Yamaha R S-201:
The sound was obviously less warm as compared to Marantz, but was 'open' and 'airy'.
Female vocals were good. Male vocals had less 'weight' (since less warm), but were crisp anyway.
Due to this I am slightly inclined towards Yamaha. Even though it has less warm, I like the 'open' and 'airy' feeling.
However I have also heard that since Yamaha is bright, the highs can cause listener fatigue after some time --> That is what I am worried.
Model R S-201 is not preferred, but got an idea about the house sound. So waiting to audition with Yamaha A S-500.
Regards,
Amit.