Itching for better sound


Pretty happy with sound through my Sennheiser HD700s listening through headphone amp to classical CDs on Marantz CD6006...but too much headphone listening makes my ears buzz, so I want to start listening more through speakers.

Could set up either the Marantz or a NAD 516bee cd player, connected with RCA to an old Denon AVR1404 receiver to speakers.  My PSB speakers are fair.  What I want to know is how much will a pair of Kef LS50s improve my sound?  Is my $800cdn (used) better spent on something else--other speakers or another component?
shostakovich
Another option I have is to get powered speakers and to connect them through optical direct to Marantz CD player.  Any suggestions on the desirability of this and appropriate speakers that would trump the PSBs running through that Denon?
i agree that your avr is the limiting factor--i'd look at the dynaudio xeo 2 powered speakers, which are $800 new--very impressive
Thanks for the suggestion.  I will look into that.  What do figure would be the best way to connect these to the Marantz CD6006?  Optical?  The cable's going to be about 40ft.

Do others agree that this is going to get me better sound than the setup described above?