where can a 17 year old guy get the cheapest car insurance quote on a 200 pound car ? preferably 700 quid :)?

Go on the comparison sites gocompare, comparethemarket confused type car insurance in your search box others will come up. Also try direct line's website as there not on comparison sites. It might help listing an older driver maybe one of your parents as an additional driver not the policy holder as this tends to bring the price down.
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open a yellow pages. i found they would have ads crying out to people who were new drivers, woman drives, young drivers etc.

but i agree the quickest was is to use price comparison sites. don't get confused with comparethemeercat.com lol.

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google it
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As a 17yr old male driver you will not get a quote for under £1000 try Directline
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autoinsurance.maclenet.com - check this one. As I remember they have lowest car insurance rates for teens and young drivers.
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try eGroup http://simplyinsurancequotes.com/uk/eGroupmotoring-insurance-quotes.php?id=4488
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