I use all the main comparison sites when mine is due and then I look at the policy and compare it against the cost - I usually choose one in the top 3. I get the daft quotes too but the thing to watch for are the cheap quotes that then increase once you call them - I had one the increased ~£200 over a period of 4-5 phones call while trying to set it up, I didn't go with them because they told me a blatant lie about why they needed to increase it. (They claimed not to have got all the correct info from the comparison site but during an earlier phone call they read all my information back to me which I knew was absolutely correct)