You will want to check with any company that you previously wanted to go with. Be sure that the deal is still the same when you decide to sign on.
Variations In Annuity Payments
At age 65 depending on the company you are going to contract with if you put in $150,000 into an annuity that starts to pay right away, over the period of the next 20 years you could have a difference in payouts to you of as much as
Annuities For Retirement From Different Companies
Some companies selling annuities aren't very strong, and will offer better interest rates etc., out of desperation to get more money in their till. Other strong companies know their strength and negotiate from that position and are offering a more secure but lower rate.
You may want to consider that the less the company will take on risk, the more secure your money will be.
It isn't just the interest rates that are part of the package there are numerous fees and caps, penalties, limits, etc. to be very careful to understand.
You might want to consider a 401 K retirement plan.