The perfect planet? By my standards? Oh dear. Very well, let me tell you a little about...
Terminus
Probably a number of planets going by that name in fiction, usually for a reason. One of those reasons is that such a planet might be in the center of the universe. I took that notion from one source and took a different one from a Peter David book (Q-Squared, in case you're wondering) and fashioned a planet which can never die...because it mustn't.
Terminus is the centerpoint of ALL that exists. This universe, the next, the rest of them, and so on. In what manner? Well, in the universes which can overlap in parallels, this is an intersection point. It takes similar parallel-existences and ties their continuity in a knot so you could meet your other selves here. In different dimensions that aren't like our universe, it is still the center, but not physical. It connects to the ethereal level and is capable of being interacted with if you're capable of crossing existential planes or disrupting dimensional physics (which anything in another completely-different universe might).
The reason for this is that all things and all possibilities and all beginnings had to start somewhere. So, at the pressure-point to which all existence leaps from, there is this world which is a ball of matter compressed so forcefully by Event One that it is both incapable of being destroyed OR moved from its position. It rotates and the rest of the universe rotates with it. Now then...this would ordinarily be a dead world, but my imagination of a perfect planet demands that somebody took one look at this world and said "Hey! Let's make this place our base of operations!", and so the bad guys move in.
Primal forces of destruction, villainous monstrosities, evil abominations... They step in and they make the place their own, being of a power that does not require a living world to sustain them. They bring their unnatural hordes, their creatures and their minions, monsters of all kind who can also thrive on a dead world. There is heavy use of the darkest magic here, but it's also a group that has gotten into technology, and so the evil corporation that these dark specters rule also develops here and actually makes the planet somewhat livable. They attract the attention of the universe and crank out armies and say..."Come get some".
It's glorious and fun.