I have F-2's for the mains and running quintets for the center and in the back for my surrounds all powered by my Sony DG910. My question is will the C-1 make a big difference and match well with the F-2's or should I have just bought the C-2. My problem is that the C-2 is to big for my space under the TV but I'm worried that the sound when going from the left to the center to right will sound unmatched. Thanks.

I had the exact same issue. I have F-3 and C-3 is too big to be inserted into the stand. I don't want to go lower. All people told me I should get C-3 and I agree. You may use a keyboard rack to hold the C-2. Some keyboard racks can sit on the back of tv very well. 

Thanks for your input.