It would be helpful to know what aspects of the C7 you find lacking or would like to improve upon. I owned the C7 for many years and have heard the 30.1's. Relatively speaking, they are very similar sounding speakers (though I agree with the distinctions made by Tobes if not the degree of difference he describes). I would say if you like the C7 then you like the Harbeth sound so look to move up the line rather than laterally--M40.1 or SHL-5 depending on your room. If you like aspects of the Harbeth sound (i.e. great midrange, vocal reproduction) but want more (i.e. dynamics, resolution, treble extension, imaging, etc.) then see what else is out there that might strike your fancy. To me, going from the C7 to the 30.1 doesn't really get you all that much for your money (unless you can find a used pair a few years from now when the excitement has quieted down). Just my two cents....
