I agree that you may be happy with VL 7 Standard. True, it's an alpha with beta 1 soon to appear, but it has been quite stable for me through several alphas. I feel like I could use it as my main distro right now and it will only get better. (In fact, I've been using VL7 as my main OS for some time now, since an early alpha.) It uses XFce 4.8 as a desktop environment and is really a lovely thing.
You can't remove KDE from SOHO 6 because it would break too much. However, you can add XFce from the repos and never start KDE and thus all the heavy KDE stuff will not be lurking in the background. I did just that through a few release candidates. If you buy SOHO Deluxe, XFce is an option at installation time. It's not *instead of* KDE, but if you select to install XFce, you don't need to ever start KDE. I have a SOHO Deluxe partition on an old 1.3 GHz Celeron with a gig of RAM and I never use KDE, always XFce. It works very well indeed.
Once you got SOHO installed along with XFce, you could remove *parts* of KDE but not the underlying libraries.