As a C1 owner all I can say is they are fantastic. The mids and the high end is the best I have ever heard. As far as the bass I do like having a sub. For what it's worth I have a Rel B3 and at first thought the Rel sounded 'slow' compared to the bass the C1s put out. I upgraded the sub cable to a nordost baseline and WOW what a difference. You may want to consider the C2s if you are worried about the bass. Also with the C2s you really need to be at least 9ft away from the speaker to sound good. Farther away is even better
As far as power I have a Bryston B100 integrated. My Dyn dealer would love for me to get more power but what I have noticed is the Dyns really sound the best at maximum loudness. That being said I rarely want the volume that loud. But you can't always look at watts. What I mean is the Naim xs (at 60w) will play the C1s louder than my 100w Bryston. The Dyns like current which isn't seen in most amp specs.
If at all possible see if you can get an in-home demo. Then you will know for sure.
As far as power I have a Bryston B100 integrated. My Dyn dealer would love for me to get more power but what I have noticed is the Dyns really sound the best at maximum loudness. That being said I rarely want the volume that loud. But you can't always look at watts. What I mean is the Naim xs (at 60w) will play the C1s louder than my 100w Bryston. The Dyns like current which isn't seen in most amp specs.
If at all possible see if you can get an in-home demo. Then you will know for sure.