Thank you all for the info. This is the most replies I got on one post in a very short amount of time. It seems Dyn has some faithful diehards.
Glad to hear that C1s are okay for my 18x25x10 room, at least by the absence of suggesting otherwise. I pulled the trigger on a pair of C1 Sigs over the weekend. :) Should arrive by next week.
Regarding the listening volume level, my preference always depends on the type of music that is playing, so it ranges from very low to moderately high. I listen to all variety but 50% is electronic, so bass accuracy, rhythm and punch are quite important.
My amp is Pass XA30.5, so I'm hoping it is able to drive the C1s, at least, to a moderately loud level in my room. I'm not too worried about the amp staying in class A all the time as long as it doesn't clip and distorts like crazy. Based on various people on this forum and others, I'm told C1s love the current, not watts quantity, which Pass can plentifully provide.
Soix, I think C1s look good (actually looks like an owl to me) although they aren't the most aesthetically appealing of course. My gf agrees which probably is utmost importance.