I've got the 2 Disc Steelbook Robocop they released but am a bit peeved. At the time it came out I emailed asking if there was likely to be an actual 4k release given their release is a transfer of a 4k restoration and was told no, the bluray was gonna be the only release, so I bought that.
They subsequently released a 4k disc

. I don't imagine it looks massively different as their BR really is excellent but I'd have preferred to hold onto my money and wait for the absolute best version available.
I've not seen the Arrow transfers but I've seen OldBoy which never really clicked with me. True Romance and I recall liking enough. To Live And Die In LA has been in my online basket a few times but never made it to checkout.
There's definitely some crossover with our tastes though looking at that selection. Have you seen the stuff 88Films releases - same kind of niche genre stuff with lot of the Italian 70s/80s Giallo kind of stuff and spaghetti sci-fi.