Learning Curve

I'm a high-school student and next year I will start my study computer science at university. So far I have a deep understanding of Perl5 and an average understanding of C (on linux). What other languages should I learn (and in what order) so I can become a competent programmer prepared for university (say like, being able to slack of the first 2 years)?

Ok, forget about the university bit. Let's just say I want to learn as many useful and fun programming languages as I can. Which would you recommend and why? Also, don't mean to sound like a complete retard, but the topics discussed on that site seem pretty basic, but helpful nevertheless.