I suggest *not* putting it on an exchange yet.  With such a small amount of mining power, it is way too easy to 51% attack it.  The best way to perform this attack is at an exchange.

I suggest adding proof of stake first to add some amount of protection.

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Edit: Another option would be to add in fee's back in to encourage some mining.  But I don't know if that goes against your idea on how the coin should work.