Last week you were praising the coticule and telling newbs to use them as their first stone. Just admit that you are a honing junkie. lol.
The 4/8 norton is a great stone that you can shave from. Everyone should have one. I think that you won't be happy with that as your finished edge. Get it and try it out. Compare the shaves off the 8k and your coticule. If I am right you will still be looking for a finisher. Then you will buy a Naniwa 12k which you will find a little harsh. Then you will try a Thuringian as a finisher. When you are done you will have a nice pile of rocks a great shaving razor and seeking your next stone. It does not end. Don't ask me how I know. Good luck and have fun.