A lot of works by Sulek have been uploaded here, some of them are also on youtube. I would recommend :
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Last Adam a cantata that reminds me of Sibelius for some reasons (maybe the sonority of the language)
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Organ Concerto "Memento" a sort of Bach/Liszt homage with added features (military drums notably)
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Symphony n°6 a fruit salad with Tchaikovsky, Bruckner or Prokofiev being the fruits
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Classical Concerto n°2 for string orchestra
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Two Interludes from Coriolan a short work which might be a good introduction to Sulek.
I have come to the provisional conclusion that the impression left by Sulek's works is more related to the intensity of the interpretation than the expressivity of the work itself. Many of the other broadcasts are conducted by Pavle Despalj, a tireless champion of the composer, but I find him - maybe harshly - a tepid conductor.
I have just discovered this article about the british premieres of Sulek second symphony and Hartmann fourth. I don't know if political ideology is an obsession of the author or of the time :
http://archive.spectator.co.uk/article/28th-october-1955/20/musicAlso I have found an organ piece
Triptih that may have eluded some aficionados (the interpretation is a bit tentative) :
