Holy Sh*t, thats some insurance premiums being quoted. I wont share what i pay but then again i am old
Why you would want to inusre something more powerful if thats the price of your 1.6 is crazy lol.
Anyway insurance is all about pricing the risk in accordance with a potential pay out, (pretty much the same as khare said) so I would be pretty confident that you could insure 1.8, 2.0 GTi etc somewhere but expect a pretty expensive premium especially if you are young (which that sort of premiums I am assuming you are) and have no NCD. Increasing your excess is always an option to reduce your premiums, another good thing is to add a mature woman to your policy (mum/gran/auntie etc) you will find that this will more than likely benefit your quotes.
Hope this helps