S E C U R I T Y.  I know you weren't looking for that answer.  You want unique features, but they are useless if you don't have enough network hash power to protect the block chain.  iXcoin is one of the few coins which even approaches Bitcoin on this, with about 50% of its hash rate.

Yeh, I know, iXcoin has no block reward so what if pools stop mining.  Pools understand they need to protect their investments.  Some have been mining for 3.5 years!  So why would any want to dump a super secure block chain they already have and hope for a new one to come along.  That's why I think it's unlikely for pools to dump iXcoin.  Besides, transaction volume is on the rise and iXcoin has a growing development team. 

The real money is not short term mining and dumping, then on to the next coin.  It's building a strong crypto currency and a community around it.  It's years of investment in the same coin to let it grow into its own economy.  iXcoin is on its way.  If you want to jump in the price is right at the moment, but it won't stay down forever.