Valve uses 2048 textures with a texture scale of 0.125 in hammer in the remake of nuke. The regular texture scale of 0.25 means 4 pixels of texture per hammer unit, while 0.125 doubles that. Unlike goldsrc there's hardly any performance impact in doing this. 2048 textures obviously weigh a lot more so there's that, but downscaling looks a lot better. I would go ahead and make 2048 textures, that's what I'm doing for large surfaces.