If you are over 25 then you should be able to get a decent enough deal with companies like Chris Knott or Sky insurance who also give forum discounts. the reason you can get evo cheaper than the zed is the fact it is rear wheeled drive - insurance companies tend to run a mile once the see the letter RWD!
If your under 25 then your screwed, best option is admiral / elephant / bell etc. as they always did me pretty good quotes when I was younger.