Currently, I will register 8-4-5.com and c-i-t.com first as I am a domainer and these two can be sold ASAP. Considering register the domains for the rising of the value in the next 2 years, I would register in such order: ci-ty.com, ct-i.com and may leave c-i-t-y.com unregistered as there are really too many hyphens.