I say just take the Civic since it's what they're going to give you regardless of your SVT argument.
Then whenever something goes wrong with the Civic, throw it in their faces with "see, we coulda got the SVT, but nooooooo"
seriously though, keep the peace in your family and just get whatever they want to get for you.
When you move out and have money of your own to spend, that's when you buy what YOU want.
You have many years left in the future to do things your way. The few years you have left under your parents roof should be done their way.
