THE Eternal dissatisfied

Here is what my system is curently composed:
YBA 1 preamp
YBA 2HCDT amp
Meridian 508.24 cd player
JMLAB mini-utopia speaker
REL strata III sub
With Acoustic zen hologram and Silver ref cable.

My question is the folowing:
As the upgrade bug is biting me I want to change my amp and preamp combo but without add money ( or only a little)
Right now my preamp/amp can be sold for about 2000$ each
so it make a total of 4000$. I am looking for your sujestion of a amp and preamp combo that will take the most out of my mini-utopia. I tought of a Mark levinson amp preamp combo but the weight of the amp (between 100and 125 lbs) disapoint me because I don't have alot of space.
I look foward to any or your advice for preamp amp combo with a price tag for the combo not more than 4000$. It can be a tube preamp or solid state preamp, but only Solid state ampifier.