Depending on the specie of the UC Grey is what I would suggest. If the UC Grey is something like a kau or koi (specie not very loved) and the name is bad, I suggest you to down trade for a VWN UC and then trade up from that since the PC is extremly name picky and VWN UCs have better chance to trade faster/better. If the grey is something more popular like a tier 4 or a lupe, then try to trade in the same tier, improving the name, to then trade up.