OK!
The problem was addressed by the same shop keeper, the uncle didn't asked a question what happened to the amp, why I want to change the amp and also didn't checked if its blown :o wasn't able to update this thread earlier as was busy in some uni stuff.
I asked him to get me 8604 6500F and 8601, heard them all none of the amps was producing sound like before although the noise problem was solved by just changing the amp. Finally I settled with this Vibe Sound 4 channel amplifier. This amp blown one of my Sony rear speaker set and I had to replace them along. Decided to go with Kenwood 718 but heard this set JVC CS-HX7157X and selected this one.
Here are some pictures of the setup. Didn't bothered to clean the interior as the sun was at it's peak that time.



About the clean installation, I ordered the board but the installation guy said that the board will effect sound quality and the bass will be reduced highly. Confirmed with the friend who has the same setup and getting a positive answer dropped this idea.
I wasn't able to get branded RCA's from Laser Sound once again, they were only having Focal complete Kit and that too with 4,5 feet cables so I had to comply on these cables once again but no there isn't any distortion and this fulfills my demand pretty nicely.
Final Outcome:
