Like what the title says.
Brave and the Bold #32 (Aquaman & Demon)
Aquaman #34 (PAD series, Aquaman vs Triton)
Justice League & Aquaman (Throne of Atlantis issues)
Flashpoint #4 (Aquaman vs WW)
JLA Classified #3 (Aquaman vs Olympian)
JLA by G.Morrison
But in general PAD's run, Morrison's JLA run and the current one from Johns are the best.
Mine would have to be "Arthur Goes Hawaiian!" storyline (Aquaman #3-4, Peter David's 1994 series)
And the current series Geoff Johns is writing. Definitely some of the best stories I've read from Aquaman in a long time, especially the "Throne of Atlantis" crossover.