Congratulations again. Are you saving all these for after the buyout, or are you approaching enduser's directly with all these great premiums?
PIO.com would probably go for around $15,000 or more. Further something like P-O.com would go for around $3,000. So P-IO.com ought to be worth quite a bit someday.
After making a few enduser sales lately for some really bad looking LLLL.coms, I'm wishing now that I had more of these types of premiums. A google search for PIO brings up about 27,000,000 results. Meanwhile, I'm struggling to find endusers for some of my LLLL.com domains with around 8,000 results. While I'm finding it pretty easy to approach people with the fact that all the 4 letters are registered, with there being far fewer L-LL and LL-L domains, once they are all gone, I think they'll be pretty easy to sell, and less competition with other domainers.
There is a lot of potential in these types of domains if you can afford to hang onto them long term until the buyout. Recently I've begun making some websites for my best one's. Today's project FY-I.com (For Your Internet) is almost done. While I make more money buying and selling, it's nice to make a few dollars now and then off the websites to keep the reg fees paid. I tried parking my portfolio but new names with few incoming links don't do as well with parking.