Mmmm I love my series 3 to death but its expensive - not just on the asking price and insurance...maintaining it...fuel, services, etc...all contribute to making the car a very hungry machine. But i never expected any less and knew all this when buying it.
Of the three...i dislike the second. Id go with the third - Nice, fairly subtle and in a nice shade of blue.
Just make sure you know what youre getting into, legally, financially, etc - before you even look at buying one.
Research is important. I'm not saying dont buy one - just have all the facts. And know what to look for - cuz there are a lot of tired, sad GTRs out there.