Most of these I have never heard of. The ones I have I have never seen.

I will have to check into some of these.

Its full of nasty sex and violence - funny as hell. Its by the same guy who did Giallo a Venezia .

I'm sold.:D

If I ever have the opportunity to remake a movie, it will be "Jaws 2." It is the most underrated story of a fallen hero that must throw himself in the path of danger for people that have lost their faith in him. "Open wide!"

Ok here's my take on the ones I've seen from your list


Four Flies On Grey Velvet (1971) I loved this vastly underrated Argento giallo not straightforward at all. Cat O Nine Tails (1971) is more straightforward but spookier. This one is more surreal
Let Sleeping Corpses Lie (1974) I have a horrible feeling I may have saw a cut version because I was very confused as its also known as The Living Dead At Manchester Morgue and this title didn't make sense.
The Perfume Of The Lady In Black (1974)This is AMAZING see it!!!It is unique and extremely weird just enjoy the ride while you watch don't think about it too much.
What Have You Done To Solange? (1972) This is very good similar to Giallo in Venice or Death in Venice are those the same film I'm confused though its not as violent and some people say its better for that.
Nosferatu The Vampyre (1979)I hated this prefer the 1922 original
Black Belly Of The Tarantula (1971) Excellent Giallo a bit macabre though if you don't mind that
All The Colors Of The Dark (1972) Underrated and hard to explain without spoiling the plot a different twist on the giallo format.
A Lizard In A Woman's Skin (1971) This is way ahead of its time one of the more inventive giallos has a very dreamy quality to it and becomes nightmarish too. Also check out Don't Torture A Duckling (1970) hugely controversial at the time and is even more intense than Lizard but not as ethereal.
The Case Of The Scorpion's Tail (1971) More of a standard giallo you might prefer Torso
The Psychic (1977) One of my fave ever films please do not read anything about this spoilers are even given in its plot synopsis on the back of the dvd. It is slow pace but makes up with atmosphere and becomes more and more sinister. A more supernatural horror than giallo.
Don't Deliver Us From Evil (1971) Another controvertial film quite cruel but refreshing and never predictable.
Equus (1977)Don't bother
Martin (1977)Very very good has a go at vampire flicks so beware of that but original
House (1977) I was very disappointed with this but some people swear by it.

Thank you Fear. You really know your stuff.:)