Interesting...didn't even know there were bootleg carts of GEX. That's just the first Game Boy Color game, right? The funny thing is, I just ordered that game (the real version, not a bootleg) from eBay...so it's kind of a coincidence that I saw that in your collection.
Also, that Space Invasion and Karate Joe cart. Glad to see you have some appreciation for Rocket Games. Do you know where I can find any of Rocket Games's games? I would like some of their games such as Painter. I don't even think they're on the Bootleg Games Wiki yet...