How about some Larry Niven – Ringworld for starters.
See the previous page. Re: Player of Games – that’s the one Banks novel that, having read once, I can never go back to, I find the main protagonist to be so irredeemably unpleasant that I just don’t enjoy the story. I know that many/most of the characters in Banks’ books are morally dubious, but they do, mostly, have redeeming qualities.
Niven & Pournelle’s Footfall & Lucifer’s Hammer were gritty, but are now pretty dated.
And that’s going to be a concern to a fourteen year old just getting into SF?
Niven wrote a whole bunch of books that are hugely enjoyable just because any science in them is assumed to be so far advanced that there’s no point in getting nitpicky about any perceived flaws. Even Niven admits there are aspects of Ringworld that he got wrong, but really, who gives a shit, when you’ve got aliens like the Kzin and Puppeteers!