I'm from Scotland so my ideas might differ slightly, but I love toilets in bathrooms and wanted one in our house but our builder refused because he was a bit rubbish. A second toilet is always worth it and showers over baths are fine as long as you have sticky dots to stop you from slipping. I like shower curtains though as you can get some really funky ones and it is always easy to make your bathroom look completely renovated with a new curtain and floormat.

So yeah, I'd put in a second toilet.