I've never seen any Argento / Giallo movies, but those you've mentioned plus Tenebre are long time members on my Amazon watchlist.
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Saw Blue Valentine yesterday, worth watching and provides for a fine open ending, one can see that the director shot documentaries before. Very nice and intelligent person btw. Saw a discussion at some indie festival with the actors, producers and the director - what a charming bunch.
I much prefer Argento's gialli over his supernatural films. It's a toss up between Tenebre and Deep Red being my favorite Argento films. Tenebre is one of his most linear films as far as story. The whodunnit part is excellent. I really hope for a U.S. blu ray release eventually since the Anchor Bay dvds are going out of print.
Inferno is relentlessly frustrating, like Suspiria the core story is interesting but the execution lacked even more than Suspiria. And they are not scary films like the gialli. I can see why I've only seen this film twice. It promises so much and delivers very little.