Chris,
I quite like the current Golf in GTI form, but even so, it's not as nice as your stunning red IS200, I really liked it when I saw it at the Haigh Hall show. Puts my IS200 to shame condition-wise.
Why would the Golf be cheaper to insure than the Lexus? That's not right as it's a much quicker and higher group car.
Just shop around you'll get the IS200 insured cheap.
I went on Moneysupermarket and got a quote off them. I got a ZS180 (not a cheap car to insure) covered for about £350 a year, Moneysupermarket had that price but it was with Swiftcover, who are not worth touching, but then I phoned Adrian Flux, and they matched the price...