On a line by itself, which looks best in your opinion?<br/><br/>1. Hi David,<br/> Blah blah blah...<br/><br/>2. Hi, David:<br/> Blah blah blah<br/><br/>3. Hi, David,<br/> Blah blah blah<br/><br/>4. Hi, David –<br/> Blah blah blah