I'm considering buying a G2 Grimlock MOSC but not sure which version I should get. I understand that there's a turquiose blue, a dark blue, and original colored silver version. Is the silver the rarest? What are the average prices for MOSC versions? A quick look at Ebay showed $300-$350 for the MOSC dark blue version but only $95 MOSC for the silver version. Are these decent prices or should I just wait? Thanks.