"omg" is a good prefix to have on a domain. In order to optimize your return on this domain, I would make sure you market it with the domain extension. In other words, come up with a sales pitch of "oh my god chucky cheese..." or something to that affect. Of course, this is a silly example... All I am trying to say is that if you have the domain marketed as a meaningful phrase you will get higher buck for it.
For instance, I have www.vip.cc. I have developed the website into VIP Consumer Credit. While the .cc extension isn't the most widely known, I have attempted to maximize the domain's marketing potential. If you do the same, I would expect your domain to bring in no less than $200. Make a minisite and get some traffic, your value could reach even higher.
In response to the extension, I was also thinking along the same lines. I own faqs.cc and I was thinking of developing that into a guide for credit cards (much like your idea).
.cc IMO is right after .org (others think it's .tv).
the cc ccTLD has been around for a while, and is the easiest to remember given it's a repeated letter.
your domain is a very used acronym.
Thanks everybody, I know I've gone a bit CC crazy lately but hopefully this one pays off like said above. I'll probably hold on to it for a while and possibly develop it.
Low-Mid XXX for this domain IMHO. OMG is a highly used term, not sure on how you'd brand it. Maybe a site with "OMG" inducing pictures? Either way, good reg.