Where do I go from here?

Ctwith3, if you are in a smallish room the CM2s are just fine. They should be on stands with the center of the speaker at ear level. Add a second subwoofer and put them just inboard of the stands. Next, if you are using a unipivot arm, sell it and put a gimbal bearing arm on it. VPI now makes one and I bet it fits perfectly. This will improve your bass quite a bit. Then you can work on electronics. Good cables work anywhere with anything. Don't get stuck in that trap.

An easy way would be to start with the Amp and hear for yourself.
Existing components are familiar (to you) and of high quality. 
Do a little Homework and decide what you might like to try.
+1 @mijostyn on the CM 2 plus a Sub ... Good!

Given your equipment I believe I would upgrade from the Rotel amplifier. Otherwise possibly the speakers if you are wanting to change the character of your system. Then an amplifier to compliment the new speakers.

If your CM2s with sub are working for you then the amplifier.

One persons opinion. 

Thanks everyone.
Another sub is not something I would have done, it's money that can go into new speakers. The room is 22' x 14', but because of other furniture my system has been relegated to the half of the room where the foyer provides entrance to the living room, with the stairs going up and down and a short wall  (my house is a split level). I can stretch out a little into the space where the foyer and living room meet. I decided to bite the bullet and ordered a pair of Harbeth 30.2 XDs, which are actually coming tomorrow. Next purchase will be a replacement for my Amp, but I think that won't be for a while after the speakers, bathroom remodel, and the upcoming kitchen remodel. My dealer suggested Analysis Plus Silver (I not II) speaker cables, but I may just get my Cardas Neutral Reference bi wires reterminated unless someone grabs them fast on fleabay. Hopefully I can stack the bi wire spades on the terminals and have more time to do research.