Just to agree with what overseer said earlier, just because you get a newer car doesn't mean that it's not going to go wrong. How many people have nightmares with brand spanking new cars ! Even if you get a late mk3 it's still going to be about 6(ish) years old. At your age it probably would make more sense to get a 1.6 and do it up due to insurance etc, but you might not be happy and still strive for the GTi.
I've had my cab for a year now and I'm a lot older than you, I wish I had got one years earlier, so much wasted time driving bangers because I was waiting until "I was older" to get the car that I really wanted. Life's too short, get the car you want and forget about the people who will take the mick, some people will just never understand.
Hope you get what you want matey
