First off, I would think that the W-5 is going to pair up very well with your Thiels, and I would not think that a shift to Classe' would be a huge difference. More of a side-step than an upgrade, but perhaps a sonic signature that is more pleasing to you. When I went looking to upgrade amps to drive my Thiel CS3.6's, my shopping list included Classe', Moon Audio, Krell, Theta, McCormack, Bryston, Edge, Pass Labs, and a few others. I listened to as many of these as possible (though not Classe'), and to my ears, the Theta Digital amps were by far the best pairing for Thiel. Talking to Shari at Thiel, she said that for the last couple of shows, they have used Theta Digital amps, and they are thrilled with the response. Talking to Theta, they use Thiels (including 3.6's) some some of their benchmarking, so it seemed a good match. I ended up with Enterprise monoblocks for the 3.6's, and an Intrepid for the HT. A two channel Dreadnaught II is a fantastic amp for your 2.3's.
Good luck, Tom.
Good luck, Tom.