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iternabe That sounds like a good idea, as it will buy time to look at different accoustic pianos - they are beautiful but can be expensive so it's not a decision to be taken lightly.
Animisha Do you have room for two pianos? Are you considering an upright or perhaps a baby grand? There are so many options.
I can imagine that playing an acoustic would probably require a different technique as the keys are probably quite weighty compared to a DP - maybe that's why you found that your playing was slower on the acoustic? The DP could be better for playing quietly (volume low/headphones) when you're learning new pieces and don't want to disturb other people, while the acoustic could be used for playing pieces you've already mastered - I imagine you could really make them sing on an acoustic.
"Don't let's ask for the moon, we have the stars." (Final line from Now,Voyager, 1942)