It would be nice to have other interior options, but I'm assuming the option packages are configured in a way to keep the ST's price low. I went with the ST2 package, as it had everything I wanted. The only thing I would want from the ST3 package would be the full leather recaros, but I couldn't justify the extra money to get them. And the ST2 package already put the car way over my price range.
That being said, I still think the ST2 package is the best value when you consider what is included. Those partial leather Recaros are sweet (and give you the option to add some color to the interior), you get a 10 speaker Sony audio system with XM and HD radio, 8 inch touch screen with MFT/SYNC, and dual zone climate controls for 2300 bucks.
I have a Boykin Spaniel that sheds pretty badly, but I'll just grab a $40 neoprene seat cover from Pet Smart. I hope you decide on the ST; it'll be a fun commuter!