Upgrade to Simaudio or keep my Classe?

I would have to agree with Arkio on this one. I just swapped out my CA-300 for the new Sim Audio W-6 monoblocks. They are a couple grand less than the W-10s, but a significant step up from the W-5. The W-6 are about 1K more than the W-5, but you get a serious 425W/monoblock @ 8 ohms. I also purchased the P-5, but can't give you much info since it hasn't arrived yet. Should be here this week.

Sonics are definitely improved on the W-6. There was nothing glaringly wrong with the CA-300, but I was looking for a more natural/neutral sound, speed, and presence. I got all of them.

When I store demo'd Sim, the system was Eclipse, P-5, W-5, Wilson Benesch Curves, Harmonic Tech interconnects and cables. It was an impressive setup, and I will probably replicate it at home, but felt that the system lacked some power (hence the W-6), and that I might try to find a pair of used ACT-One or Two instead of the curve for now.

If I were in your position, I would take a different path. The Amp seems to be perfectly fine to me therefore, the preamp would be the first thing to upgrade....I would recommend any of the many great offerings from BAT, it will add quickness and sophistication that your present pre does not have. Another great recommendation would be a First Sound Presence Deluxe II, which goes for around 2k used, but it will add great sense of drive and neutrality, albeit never cold. It can compete with really expensive preamps and I am sure it would smoke any Sim preamp offerings sonically. Though the First Sound is very minimalist in priorities, no remote and you will need to deal with a true mono design....switch inputs and volume twice, for the L or the R. Check the raving review at Soundstage. Another thing I would concentrate on is the DAC section. What you have is already outdated, I would recommend an excellent one box solution with 24/196Khs decoding or a separate DAC such as the Bel Canto DAC-2.0 or the much touted, but extremely affordable ScottDixon DAC. I think with these two places to upgrade, I am sure you will find your answer....but if you insist on Sim Audio....check the recommendations of the previous, very knowledgable fellow.

My W-5 blew away my CA-201.