Actually I don't have a link for the Gorecki, only the Mahler.
I like Mahler's symphonies best, too, though I also enjoy Das Lied Von Der Erde (especially the awesome last movement) and Kindertotenleider.
As for the symphonies...I think I will always like the second one best. After seeing a DVD of Claudio Abbado conducting the 7th it has become a favorite as well. My least favorite is the 8th, but it's probably just too complex for me to get into at this stage. Maybe in a few years.