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What is the best stucture of SEO friendly URL?

I am working on a job board, and i'm trying to figure out a good design for URL structure.

Some things that I have found through research:

• 100 - 150 Chars long is ideal
• 3-5 words in your url, according to Matt Cutts
• Use .htaccess to force clean urls
• Do not duplicate data (important)
• Clean and precise, describing the content
• Use hyphens

On the homepage, I try to detect the users location based on IP, but this isn't always accurate, and not always reliable.

So until they put in their city/location, I can't always use this structure but this is potentially work-able.

For Searching, a form post to a results page:

domain.com/jobs/[city]/[search]

ie: domain.com/jobs/toronto/sales manager/

• OR

domain.com/search/jobs/toronto/sales manager/

or do I remove the word JOBS and just use Search. I trying to keep good search terms in the URL, but also keep it clean and concise.

Can someone give me some feedback and thoughts to 'why'...