I guess it all depends on how much money or time you want to invest whether you want to paint the black mirrors or get the GX or factory painted mirrors. From the pictures I've seen of the GX mirrors, it actually does appear that they might fit, however, the length of the wiring is too short, and I have no idea about the plug.
I'd love to have the Titanium color-keyed mirrors for my SR5, but there are several other mods to do before that. I added the factory, heated, mirror glass to my mirrors already. I still have to get rid of my 17" 5-spoke rims for some 17" Sport rims before the painted mirrors mod can even happen for me.