Well, I know this doesn't look remotely like a planet, I had to figure out how to draw a planet in Unity3D in a way that didn't have holes in the generation like some of the other generators.
These are three generations of the planet generator, with medium, high and extreme vertex resolution. For the moment I'm going with planets that have a high resolution.
Medium; 2,562 Vertices and 15,360 Triangles
Large; 10,242 Vertices and 61,440 Triangles
Huge; 40,866 Vertices and 245,760 Triangles