i personally like the idea of datacoin and anoncoin. For datacoin i like the idea of data decentralized and backed up in many various locations making hard to eradicate it and anoncoin for proof of concept of the idea that zerocoin properly implemented does work and takes the level of anonymity up a step.

the reason there are price discrepancies between the market is 1) the ability to convert from crypto currency to fiat and 2) the amount of coins the exchanges are transferring. For example if you have a small amount of coins, some one could pump the coin up and cause an inflated price but if you have a large pool of coins moving much harder to manipulate.