Yes but this is a few grand off the cost of most z4's with the 3.0, hence the consideration.
Why do you think it looks naff? is it the wheels, as these can be replaced for circa £500 or just the fact that it isn't the 3l?
I understand that there is barely a mpg gain and little reason to get the 2.5, but I'm used to a 96 mk1 mx5 so would be wow'd by the power of a horse and cart at the moment. (Don't get me wrong, I love the car for what it is, I just require something more comfortable and modern.)