Ajay, unfortunately as you buy better speakers, it will automatically "DEMAND" better source. You cannot stop it. As you go higher end, the weakest link will be more and more audible and believe me you would either want to downgrade your system so that you dont hear those weakenesses or upgrade your weak link. Balancing act becomes very very important there.
Just in case I am not very clear, I would give an illustration, assuming that you have a fairly decent amp, a 50k source would rarely do justice to a 200k speaker, so if you have another 100k to spend on audio, if you try spending it on speakers again, you have a speaker worth 300k and let me promise you, you are going to have a hard time now listening to music since it will reveal all the flaws in a rather unforgiving manner. So you are better off upgrading your CDP and you would reach a new level of sonic refinement and enjoyment. So your final configuration would be a speaker - 200k, CDP - 150k.
As far as flac is concerned, I am yet to hear a computer sounding as good as a high quality CDP. It will take time buddy. By the time it is a proven concept you would have lost 5 valuable years of music listening. 5 is an optimistic number BTW.