Once it is released, ORCA 4.0 will have support for Grimme's
PBEh-3c small-basis composite method (
doi:10.1063/1.4927476) which should handle a system of that
size without difficulty on reasonable hardware.
ORCA also has
the machinery for implicit solvation and excited states via CIS, so mechanically
the calculations should be feasible.
I have no idea how
well suited the PBEh-3c method is for excited states, though. I don't
believe Grimme et al. examined excited states in the above-linked introductory
article on the
method.
-Brian