where do i go from here?

thinking about upgrading again and was wondering where people thought i should go, i.e., what's my weakest link and what upgrade would give me the most sound difference for the buck? thanks in advance. this is my first post but i've been reading for a while and find most of the comments posted extrememly helpful.

I've been upgrading via used equipment for a while (everything at this point except the cd player i picked up used) so i'm looking to go that route again.

Components i've been looking at include the Talon Khorus' in a speaker, the Electrocompaniet or Meridian 508.24 in cd players and the Bel Canto's in a bridged monoblock setup but i'm still not sure what makes the most sense. any suggestions would be greatly appreciated.

i'm currently using:

Thiel 3.6
Conrad Johnson MF 2300
Conrad Johnson PV12
Meridian 506.20

At this point, for my ears, the biggest weakness in the system is the lack of bass which makes the thiels a little forward sounding in the upper ranges.