If you like single-player missions, you'll love A Grander Vision. Most interesting are the Infested Zealots (Fenix). When one of these units comes close to a Terran ground unit, it will detonate in a wave of psionic energy.
You start off as a Terran base with the aid of some Protoss Elite Zealots. These Zealots are effective against their former comrades, because they will detonate when attacking Protoss units.
Later in the mission, your attention is drawn to a Chyrisallis. The Chyrisalis hatches, and an Infested Dark Templar hero hatches out. The Infested DT is VERY hard to kill, he can die multiple times before being truely vanquished.
If I were to give this map a rating, I'd give it 9/10. I truely reccomend it for anyone who likes single-player campaigns.
Download link:
http://www.staredit.net/index.php?download=2989