Just run loads and loads of insurance price checker searches on lots of different models of car. There's no rhyme or reason to car insurance premiums - insurance groups are certainly a poor predictor.
My experience is that if it's the sort of car people your age like, and are likely to buy with someone else's money, then the insurance is often pricey. Something offbeat is generally cheaper to insure.
The only problem is that girls assume you've borrowed your Dad's car if you end up in a Mondeo.