I find it hard to name 5 favourites. I saw a Van Gogh exhibition in New York and just stood there until my daughter tugged me away - he has to be my favourite artist. 'The Potato Eaters' is so heartbreakingly, muddily powerful. Some of the others make me want to weep.
Monet's Series paintings - yes, again I've seen them in exhibition (in London) and they are mind-blowing in size and brilliance.
The one painting I hadn't expected to hit me in the stomach was in the Uffizi, just after its restoration had been completed. It was one I knew from pictures, but they had never conveyed its power.
It was a Michelangelo (more known for his sculptures), The rondo of 'The Holy Family'. It was the sole occupant of the end wall of that gallery (it is big). I was not alone, but with my non-arty sister and equally 'ignorant' younger daughter. I heard them both gasp when they saw it.
So, I knew every painting in your original list, bednobs, and I had to grow up a lot before I could 'feel' and understand 'Guernica'. They are all wonderful, wonderful paintings.
They are probably the most recognisable/amongst the most recognisable paintings in the world. It would be wonderful if people recognised a few more.
P.S. Another favourite of mine is Durer's 'Self-portrait' (1500).