You will be just fine in a room of that size. Even though they are rear ported, you can put a c1 within 6-10" or so of the wall and still get great sound. If you get too much bass, but a foam plug in the port. You will likely need to do this.
Amps: I would go for something more along the lines of a nice high quality 50-100 watt ss amplifier or better yet a tube amplifier. In general low powered quality ss amps tend to be a little sweeter than high powered. The lower power in your room will result in less authoritative bass, which will help with the small room. A tube amp is great with C1's because tube amps have wonderful low level resolution and the C1's Esotar tweeter will show this off quite nicely.
Disclaimer: I have financial ties to av industry.
Amps: I would go for something more along the lines of a nice high quality 50-100 watt ss amplifier or better yet a tube amplifier. In general low powered quality ss amps tend to be a little sweeter than high powered. The lower power in your room will result in less authoritative bass, which will help with the small room. A tube amp is great with C1's because tube amps have wonderful low level resolution and the C1's Esotar tweeter will show this off quite nicely.
Disclaimer: I have financial ties to av industry.