The 4cylinder model of the EOS is suppose to list for 28k MSRP, the V6 model for 35k. The EOS is not competing in the same class as the Solstice/Sky. It actually seats 4, has a trunk, and has a much nicer interior. They are going after the potential Audi + BMW convertible crowd with this one.
Also, the Solstice is MUCH more bloated than the EOS. I tiny RWD 2-seater with NO trunk space which is almost 3,000lbs when miatas are sitting around 2,400-2,500lbs