There really is no comprehensive site that I have found, I asked the same question a few months ago. One site that I use a lot though is
Exit Upstate - Subdivision Quick Links - Greenville, Spartanburg, Anderson, Greenwood SC Once you have narrowed down your area, it will show you pretty much everything that is for sale in a given sub or district. What I like about it is that looking at the pictures of homes interiors is better than on realtor.com and it gives a little better information.