Severance agreement arrived, need a second opinion - what worked for you?

I was offered 4 weeks of severance after 4 years as an IT help-desk technician, and I have a few days to sign. I do not usually post, so bear with me. I do not want to leave money on the table. What did you ask for?

Thanks for writing this out. I went through something close to it last year, and it settled down once I kept a simple log of every call and form.