Um not a great question because GWX 1.03 doesnt really need any xtra mods since it is already a comprehensive upgrade already and you would have to go thru the readme to be able to tell if there would be any clashes with mods you would want to add. If you are thinking of a mod to add, check that GWX 1.03 doesnt already alter the same thing.
However, there is a list of eye/ear candy mods released by Venatore that are GWX compatible. Link:
http://www.subsim.com/radioroom/showthread.php?t=103714