Depends at what point you can afford to run the risk of crashing and being left with nothing.
So £2400 to insure a car worth £2500.
I'm sure you can work that one out for yourself.
Mat.
Most quotes I got on my daily drive 306 where only about 10-20 quid more a year for fully comp so I just paid the extra. As others have said anything worth more the amount of spare cash that I would have in the bank to replace it I would insure f/c.