I've heard forever that Muv Luv is some great VN with MECHA, but $28 nah I've waited 10 years to give a shit, I can wait a couple more until it's $10.
Darius Burst CS has never gone below $25 in like the year since it's been released, which is kinda crazy. I dig Darius, so I'll play this one for sure, but c'mon, get under $20 already!
Otherwise, yeah Cave stuff is good, but I haven't felt the need to double-dip yet while my X360 versions still work. Eventually I'll replace them all with PC versions. Also the CAVE games released so far aren't my favorites though I love Death Smiles. When they released Mushime Futari or Akai Katana I'll jump in.