Suggestions for $2k budget

What type of music do you listen to?  If you have a specific budget, I suggest you consider selling your amp and think of it as a “system”.  The amp and speaker need to have synergy in order to sound good.  

There are different routes:
1. Low power tube amp + high efficiency speakers + subwoofers (later) if you want more bass

e.g. Decware or Firstwatt F5 or Almarro  + Zu Omen Def I Or Spatial Audio M series.

2. High current (power) amp + planar speakers + subwoofer (later) if you want more bass

e.g. Your Adcom + Magnepan LRS or 0.7.  The LRS got rave reviews considering its price.

3. High current (power) + not so efficient, full range floor speaker, no subwoofer.

e.g. Your Adcom + Tekton Design Moab
I haven’t heard it, but just read several good reviews.  In general I haven’t heard any floor speakers I like so far.  Maybe I haven’t heard those super expensive floor speakers driving with super expensive McIntosh monoblocks.  I listen to B&W 802D and I didn’t get “wow” considering the price tag.  
4. Monitors + subwoofer if you have a small area

e.g. Your Adcom + Heresys III or IV.  I haven’t heard both, but reviews say IV has better bass.  Heresys is also pretty efficient, you can upgrade or move to a lower power amp later.

Route #1 may exceed your budget because you need a new amp.

I just realized you listen to rock and electronics.  Then I would suggest Tekton Double Impact or Klipsch Heresy IV.  I haven’t heard them, the suggestion is more suggest to check them out.  But they are pretty new, so may be hard to find one in the used market, and hence may not fir your budget.