I'd go the 109, great pilot friendly machine, comes standard as single pilot IFR and wx radar a delight to operate, we also fly in a salty enviroment and so far all is well.
We have been happy with customer support and warrantee issues.
Sounds like the grand may be a better machine for you with 12 or so extra inches, I believe you can set up to have all seats facing forwards.
Don't know about the 135 but the 109 also has emergency exits through the rear cabin windows, and front door jettison systems.