No one really knows how google works (apart from the bods at google of course), so everyone has an opinion of the best way to work the system.
Supposedly the more keyword you have the more diluted you will make them. I would probabaly go for a mixture of 1 and 3 and have sometihing like Converse fOOTWEAR AT sITE NAME.
Hi,
It is better to have converse your site name
be sure that your site name matches the content
and not lengthy names