Replace amp or speakers ?

I would think that Rowland amps are in another league based on rep, but have not heard either.

Change the amp first.

I would vote for the amp, for several reasons. I'm not impressed with that amp. Plus I think you will experience greater improvement in your system by upgrading closer to the source. I checked out your system, and think replacing the PS Audio would give the biggest bang for the buck.

Let us know what you decided to do after all.