Two awesome cars! Seems like your insurance is ky high though unless you have a lot of tickets.
I just paid $495 for 6 months on my 08' Audi A6 and our 10' Volvo XC60. I have 2 speeding ticket too but my wife has none. We do get a nice discount because of the home owners insurance being with the same company. Do you have both policies with the same company? My Audi was also $60,000 and the Volvo was $42,000 so the amount shouldnt be too far off. My car is an 8 cylinder but probably not classified as a sports car like yours so that might make yours higher.
We use a company called Grange for our insurance, maybe look at them. THey just came out with a great new policy that dropped our rate from $700 for 6 months to the new $495. Might save some money. Main thing is to have your homeowners with the same company.
EDIT, also paying once every 6 months rather than once a month saves us some money too. If you could get the coverage at a lower price, which you should be able to, you could swing the 2x per year payment.