I was trying to recall which tires I had that were great dry but about equal to the RS-A in the wet...
...it turns out that it was the g-force KD. Maybe just a slight-itty-bitty-bit better than the GS-D3 and the Michelin PS-2 in the dry, but DEFINITELY BEHIND OR LESS CAPABLE THAN EITHER OF THE GS-D3 OR PS-2 IN MILD WET.
Different car, not a production Solstice. I don't know if the PS-2 is available in the 45 series size - may have to drop to a P245/40R18.
I don't recall if I ever did a Pilot sport VS PS-2 evaluation, but I think the straight Pilot Sport (if you are a michelin fan - they always tend to be more expensive...) is slightly less capable than the PS-2.
If the PS-2 is not available as a P245/45R18 and you want to stay with stock size, then that basically leaves (in my opinion) only the GS-D3 and the G-force. The G-force prolly has a teeny edge in dry, but is definitely noticeably worse in the wet. I preferred the steering feel and turn-in on the GS-D3, but that is personal opinion.