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
Forgot to mention Pulsars on are my  list also, 2 pairs were advertised on here recently but got snapped up very quickly.  Guess that is a good sign! 
Yes, put the system on the long wall if you can, and play with toe-in. Often a big difference in bass quality and imaging.
Then put some silver coated copper speaker cables in there. I recommend Mapleshade (awesome and quick and transparent, but can be a bit tempermental) or Morrow Audio (start with SP2, terrific midrange, and quick enough).
Try this before going down the speaker/amp change-itis rabbit hole...
Still here!  I just wondered if anyone has some advice for new speakers priced under $3000 (Used). As I listen to all types of music and my room is not ideal (see earlier link) I think I am going to go for some monitors or smaller floorstanders.  I like the odd bit of electronic music so bass is a must.  So far on my list are:
Volent VL2
Tannoy DC8
Prana Fidelity Fifty90
Proac Response 2

Some other that have caught my eye (should be ear) are;

Proac Response 2.5
Tekton Lore S
Spatial M3 Turbo
Alta Audio Rhea

Any help greatly received, happy new year.