I don't know the recording mentioned, but I agree that these 3 concertos (1st cello, 2nd piano, 3rd violin + 4th piano concerto) should be the first stop. The 2nd cello concerto and the remaining piano concertos are also worth checking out, the other violin concertos are far less important (some more like short concert pieces). I have heard his tone poems but don't remember them well enough to recommend them.
The most original chamber work seems to me the septet with trumpet, think neoclassicism a generation or two earlier. The most famous chamber piece might be the d minor violin sonata, but all the other sonatas, trios, quartets, quintets are nice music if you like broadly classicist romantic music. I don't think it reaches the best of Franck, Fauré (or Brahms) but it's worth trying.