Sanjay, your questions are valid and certainly to the point. My guess, there are no members with EXACT experience to guide you. Many here including myself, will say nothing rather than guess.
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Agree with Albertporter.
I could only say the change you wish to know: "will it be worth it, will it make enough of a difference" My gut feeling is no, it is not enough of a difference to be worth spending the money. However that is NOT an expert opinion, just a general experience opinion.
When in the past I have upgraded only a small step, it was not worth the money. However if one of the items broke, then upgrading a little bit, instead of getting the unit repaired, would make sense.
We have all asked the same question if a particular upgrade is worth the $$$. That is subjective and different people will give different answers. This is something only you can answer for yourself. There is no wright or wrong.
My advice in general would be to upgrade to a better amp or pre-amp because it would benefit all sources. Try and see if you can audition different pieces in your system and see what gives you the biggest improvement for the money spent.
I hope this has helped and that you find what you are looking for. Good luck!