For once a list I've actually read a lot of the contenders... Avoid The Pilgrim's Progress, it's unbelievably boring, but that's the only one of this set I'd kill. Several of these would be on my must-read list, but perhaps especially Frankenstein and The Picture of Dorian Gray. I'd love a review of Roverandom, which I haven't read; I love some of JRRT's non-Ardaverse works (especially Smith of Wootton Major) but others are decidedly odd and/or twee in all the worst ways.