Picking a name

It's tricky picking a name for my business.

I want it

• to be catchy and professional;
  
• to be unique - at least for Toronto;
  
• not to bring to mind an existing entity that has an image I don't want for my own business;
  
• not to be preachy or dictatorial.
  

I originally went to my friends and got 18 suggestions. Some already existed. Here's what we whittled it down to.

• Touronto
  
• Histourical Toronto
  
• Merrily we stroll along in Toronto
  
• Toronto on your toes
  
• Toronto in a Nutshell
  
• When in Toronto, Roam
  

The top four were Touronto, Histourical Toronto, Toronto on your toes, and Toronto in a Nutshell.

I'm partial to "Toronto in a Nutshell", but I think I'd have to contact the person who originally used the name for a course I took as a kid. A kids'guide written by us kids came out of the course, and I need to make sure it's OK to use as a business name.

What do you think?