I had not looked at Quark before. I thought it was just another scum coin. That looks very interesting indeed. A coin with a USP focused on security is definitely a niche.
Look again, Quark is a complete scam from the outset.
SecureCoin is based on Quark so it uses the same hashing changes but it has a sane economy behind it.
Nearly all Quark will be mined by the end of this month - that's right - nearly all of them.
SecureCoin uses the Bitcoin coin generation model hence it has some sustainability as the coins will be generated over many years instead of a few months.