Visual Novel recommendations

The Steam Summer Sale is upon us, and I was thinking about getting some visual novels. My VN backlog on Steam is pretty much empty, VNs don't get bundled a lot and don't really end up in nice sales compared to normal games so I'm not sure what I should be getting. Also, browsing the VN category on Steam is ridiculous, it's filled with either sex simulators or games that aren't really VNs but have text dialogs.

This is the list of novels I've read. I think mystery and/or horror seems to be my thing. I'm thinking of maybe getting Umineko (as a big Higurashi fan) and CHAOS;HEAD NOAH, I'm also thinking of maybe reading ATRI -My Dear Moments- since there's an anime adaptation coming up and I remember the demo was nice. Maybe I'm also in the mood for something light too, I've mostly read some heavy shit lately.

What VNs do you like? Will you be buying any novels? If you're looking for recommendations, I might have some too.