Help with upgrade path

Hi,

I'm looking for some help and ideas with upgrading my system:-
Alchemy DDS Pro Transport
Alchemy Dti Pro 32 anti-jitter with PS2
Ead 7000III DAC
Conrad Johnson CAV50 Integrated
QLN Signature splitfield with external x-over
Various cables, vibrapods, Lothian supports

For those not familier with the QLN speakers, they are a very well regarded Swedish speaker, monitor, something like Talons.....nice imaging and stage with great bass for a monitor.

I'm OK with the general sound but want to build more on the present qualities of the system. Looking for stage improvements in width and depth, with improvements in imaging.
I listen at fairly loud levels so the stage tends to scale-down when I crank up the volume, and the sound becomes a little too 'confused'.
So I'm thinking perhaps the amp is the first thing to go. I prefer the tube sound over solid state, and really like the warm, lush quality of the CJ....some suggestions on how to move up in amp quality, retaining the tube sound would be really appreciated.

Also, I like the digital front end, particularly with the recent addition of the Dti Pro, but I can't help wondering if I should ditch the 3 boxes and go for a good upsampling CD player like the Musical Fidelity???? Any ideas on this would be appreciated. What kind of improvements might I expect with modern digital gear??

Or....perhaps keep the amp and digital and look for speakers that are more sensitive (QLN's are about 87db) that will give me better stage depth, width, imaging and hold everything in place when the volume goes up.

I have about 4-5K to spend on Audiogon, and would really appreciate some input and ideas.

Many Thanks!

Carl