If you want to get money, You need say I want to fix it by yourself. But you can not get the entire money they estimate. The insurance company will cut labor and tax. You can only get the rest.
May be your insurance is for 2 years. How long does it left? If it left for long time, just let the guy to call. The insurance company will not increase your price during the left time. You can use online quotation to estimate the price of your insurance with an accident or without an accident, then decide what to do. I mean use Blair Direct online quotation and other agent's.
Can you tell me your insurance company? You insured one side or two sides? Except you had bad record. Normally, this is a very small accident. It will not affect your insurance very much. If they increase your insurance, try to find the other company. I prefer to let the guy call. This is my opinion. You make your decision. $450 is too much. He is making momey from you.