TBH I don't even know if Kaine is the owner of NSC. I do have a copy of RC and took 1 look at it because I was going to clean it up and get it ready for sale with Kaine and I gave up after 20 minutes because in my opinion it's garbage. I refuse to release anything after I go through it with error reporting on and fixing every last error and this thing is just riddled with undefined errors left and right.
Another issue is that it is really outdated and not very secure. I wouldn't waste your money on it at all, it won't be worth it.
As for NWE, is there anything you can mention that doesn't make it that great? I will name a few that does the opposite. It has XSS protection, HTML filters, easy to use AJAX lib, easy to use/change templating, templatijg functions to ensure across the board looks and use, clean file structure, edit everything ingame like files and database. I can go on all day.
Or you can try out GRPG but that is a little dated itself.