im 22, ive got a is200 sport, and registered everything on my policy as standard, im the main driver and keeper and ive got 1 year no claims bonus. ive checked all the comparison sites i could think of and they all came up quite expensive. i live in london, so standardly my insurance would be more than anywhere else in the UK. i found that tesco insurance was the cheapest, im currently paying £210 per month. i think u should check tesco, especially if u or anyone u know has a clubcard with loads of points.
hope this helps.
g