Ahh petricolus! I have been trying to get some money together to get some of those, they are beautiful!
I really wouldnt recomend housing G. ulikovski with a crested mainly because of the temp and care differences. Your best bet is to get another golden. Tokays are very territorial i would never put another gecko species with a tokay unless you just had a huge wall size enclosure where they could establish thier own territory and stay away from one another. I still dont know if that would be a good idea.