I'd say the rest of the Dragonlance Modules are well worth it, not just DL1. Technically, what they list is DLC 1 which is Dragonlance Classics 1 (or at least that is what they link to). That has the first 4 dragonlance modules in it (dragons of Despair, Dragons of Flame, Dragons of Hope, Dragons of Desolation).
DLC 2 has Dragons of Ice, Dragons of War, Dragons of Light and Dragons of Deceit.
DLC 3 has Dragons of Deams, Dragons of Truth, Dragons of Faith, and Dragons of Triumph.
All of them combined tell the whole grand story.
Well I'm not going to collect Dungeon mags, as cool as that might be, thats too many and took much space
There are one or two that are classics in and of themselves. One historic module/adventure is found there which is so relavant, so impactful, that I think it hit just as much as any adventure. In it you find the historic Red Dragon Flame. If I could only have ONE module, it would be this one...over all others (even my beloved Dragonlance).
It is Dungeon #17, May/June 1989. In it you have a sequel module of sorts. It is called out of Ashes for levels 8-12 and is a killer module/adventure where experienced adventurers go to die through the Lair of a Red Dragon...and of course, at the end, the climactic battle with Flame.
However, as you aren't collecting Dungeon, if you don't want to go that route, you could always go the gonzo route of H1-H4. It is the Bloodstone series. The historic climax of all things Forgotten Realms where you go to the outer planes and the Abyss to fight it's minions and Lords in H4, the Throne of Bloodstone. Good way to die. Gonzo out the wazoo. You are trying to defeat Orcus (or steal his stuff) if you can. It's for levels 18-100.