Help, my system sounds lifeless!

Hi, this is my first post.  I rushed putting my system together when i emigrated from the UK to New Jersey.  In fact this site was partly to blame as i was attracted to the amazing  "used" deals!  I bought a pair of Dali Helicon 400 (mark I)  as they passed the WAF.  The rest of the system contains a Belles Soloist Integrated and Simaudio Equinox SE CD player, wireworld platinum eclispe 6 interconnect & Audio Art Cable Classic SC-5 Speaker Cable.  My room maybe partly to blame but generally the system sounds lifeless, with little soundstage (better when i play vinyl).  I am not feeling/falling in love with the speakers and do not like the bass response (which is often reported).  I would like to change the speakers and was wondering if you could help.  I have an extremely large cd collection (and have recently bought a used Lumin D1, but unfortunately not set up yet) covering all kinds of music.  I am thinking 8ohm with better sensitivity would be a better option.  Looking to spend around $3000-4000 used.  Some contenders include Revel F206 or F208, Tannoy DC8 or DC8T, ATC SCM40, JA Pulsars (maybe too much $), PBN Liberty, Aerial 10T (never see them used) but they must have grills as sometimes kids go in the basement.  Maybe Monitors with stands would be better option?  I am hoping the flickr link works so you can see my room (excuse the feet!).  I want to fall in love with my large music collection again!  Looking for good bass & soundstage and speakers that can play all kinds of music (sometimes I'm partial to deep electronic music).  In some ways because my taste is so vast i am not particularly looking for ultra revealing speakers (Nora Jones speakers i think you call them!).  Looking forward to the NY audio show so i can hear some systems.  Thanks for all the help, cheers Paul  https://www.flickr.com/gp/97665913@N06/a5G6d9