develop develop develop/..... thats the only advice I can give you on those. the 888 one would be a good one to develop into a casino referral site mate.
I would start to study a niche of domains like real estate or 4 letters for example and buy within that so you will have a good idea of whats a good deal and if it will grow in value. Your domains seem pretty random, C10.net will most likely grow in value over the next year or two.
888 is a very good number for Chinese, who like 8 and especially repeating patterns of them, because it sounds similar to the word for prosperity and good fortune. Here in Malaysia if you happen to get assigned a mobile phone number with many consecutive 8s you can sell it for big money. So you may try aiming at the English-speaking Chinese market (primarily Singapore and Malaysia, but also Hong Kong).