Allstate will have horrible rates. Use the help of an independent agent that offers coverage from 10+ companies. Unless you are in absolute perfect health, you can't just pick a company. The underwriting between one company and another could be completely different, especially if you have any major health issues (diabetes, any heart problems, elevated liver functions, etc etc).
Disclaimer - I am an independent insurance agent. If the above message contains insurance-related content, it is NOT intended as advice, and may not be accurate, applicable or sufficient depending on specific circumstances. Don't rely on it for any purpose. I do encourage you to consult an independent agent for insurance-related advice if you have a question that is specific in nature.