Mate, if you can afford the extra stuff (insurance mainly, the only people willing to touch a skyline are Shannons and Just Cars, who make you pay for the privelidge) i'd say go for it.
What most people here are ignoring with all the power talk is that Skylines (well, my 33 at least) are quite brilliant handling cars. When you come to a twisty section of road, that you know well, it'll be tough to stop smiling.
And in all likelihood, by the time you're 25, it'll probably be cheaper to sell up for a 34 GTT if you want one.