sorry to bump a dead thread...
but yeah, latin is great, did it in first semester at ANU, was brilliant (it was an arts course so didn't really count for anything, but i had nothing better to do). i personally found it a useful language; it's great to learn grammatically as its grammar is hugely influential and relevant to many indo-european (and, in particular, romantic) languages. plus of course many words in many indo-european languages come from latin, so that's a major bonus.
and eriny's advice in the post above is spot on; i already plan to go to lectures for six different courses that interest me in the first week of uni next year, before i decide which ones i'll actually stick with. chances are you'll change around a fair bit; i certainly did in my first semester of uni, went through something like 7 courses.