i got mine with 80k miles, pretty much mint condition, minus a few dings here and there for £950.
I had spent weeks and weeks checking autotrader/pistonheads/ebay daily. Good, cheap ones sell SO fast. soo you just gotta be quick. Im 17 as well and i know how it is, you got the money saved up and you just wana get one. But seriously holding out for a perfect one rather than blowing all of your money just because you want one now is the best thing to do. I nearly bought a complete heap just because it was the first one i saw. after about a month of looking i finally got mine and im soo happy i held out for a good one.
Good luck