Hi and welcome...the reason you can't find a forum for it is because it varies too much. for instance, even with your fairly specific list, it depends on what you consider decent, crowds, and nice. And nice weather can vary with time of year.
the closer you get to SdC on any route, the more people. I think many enjoy the Portugues, of course by sheer numbers most prefer the Frances, a nice alternative to the roads more traveled are the Norte (but depending on time of year can be wet) and I like the Primitivo...but as a road is less traveled there is less infrastructure...and of course less people to socialize with during stops. Another way to walk would be the Ingles, or even SdC-Finisterre-Muxia-SdC.
at this site
http://www.gronze.com/#todos you can click on each of the routes and get an idea of how many days long they are (but you can start at any point to suit your 7-10 window), the elevations, the things along the way, etc. You could also start, then skip some sections via train/bus/taxi to fit your time frame. Happy planning and Buen Camino!
edit: while I prefer the Primitivo, you couldn't probably get from Oviedo to SdC in 7-10 days without walking really long steps. I did it in 10 but it meant two 25+ mile days and a third pretty long one. You could start in Lugo, but in my opinion you miss the best parts of the Primitivo.