I agree, the GWX moon is huuuuge, especially with the new camera.
Ail's hi res moon mod has a small moon option. It's not JSGME compatible, you need to rename the file and put it in the texture folder manually like it says in the readme.
Here ya go:
http://s19.quicksharing.com/v/7247302/ail_hi_res_moon_v2.5_mod.rar.html