If you are going to pick up one DVD instead of a Blu-ray, Kamisama Kiss would be the one. It's animation and design aesthetic is such that the benefits it sees from an HD upgrade are less than for other contemporary titles. And the positive thing about MVM's DVD release is that it's NTSC, and encoded progressively, so you can watch it with 24 fps playback on compatible equipment, and there's no fudging around with the audio.
Then again, if you really want lossless audio and nicer subtitles (although Funimation did use a nice white font for this DVD), Blu-ray is the way to go.