I have a C-1, as do many other people I imagine. I love it to death, and the only thing I could see myself upgrading to is something with tubes. The 1.5t is the most powerful of those power amps, at I think 380wpc. They sound great, but apparently they're not much fun to work on if something goes wrong. A buddy of mine has a 1.5t and loves it. Personally, I prefer meters to LEDs, but that's just my preference. I think your choice in amp should be partially dependent on how much power your speakers need. Generally, it's good to have twice the speaker rating. Basically, if your speaker is rated for 100 watts, then you should get an amp that's 200wpc.