Hi Abhijit,
Were u having problems with a harsh/bright sound with the Rotel?dali combo? If yes how is it now that the speakers are older and ur ears are more accustomed to the sound.
Secondly this integrated is to be used as a preamp long term? What is ur opinion of the integrated 7003 by itself with the speakers?
Lastly the 5003 replaces the 5001. Have not heard the newer player, only the fact that it resembles(in cosmetics) the reference line of marantz. Best thing to do is to take ur cdp to the dealer and do an A/B or better still do the A/B at home.Cos will keep upgrading and launching new products, some are geniune improvements and in some cases its just marketing. IMO this may be a side ways move or just a marginal improvement.
Rgds