What do I need to consider to see if incorporating as an LLC will benefit me from a tax perspective?

I'm freelance and not incorporated, so can only contribute the rather lower limit to an IRA as an individual.  My income is a mix of 1099 and W2, and I had a large amount of medical costs this year. 

 

How can I run the numbers to see if incorporating and creating a SEP IRA would be worth it?