I need to make some game models that will be about as far away as units in starcraft 2. I was wondering what texture resolution they use for the game. We opened up the level editor to see them up close, and It looks like either 256. or 512, but I’m not too sure.
How about a MIP LOD system? 
Create the textures in 2048 and let the engine decide based on the relative object size on screen.
this way you can also span the options:
2048 -1536 - 1024 - 768 - 512 - 256 - 128 - 64
so 2048 is the maximum zoom in quality for ultra quality
1024 is the maximum zoom in for high
512 for low
and 256 for poor 
something like that.
I thought about going slightly higher, because I can always reduce. However, I’m on a time crunch, so if I know I wont be needing one resolution, I would save loads of time by going lower. I was thinking about just making a 1024, just to be safe, but If I knew for sure that Starcraft (which looks great especially for what we’re doing) uses much lower, then I can skip the much higher ones.