What do you use at school? If you can learn all three (or at least get comfortable enough with 'em) you may have a leg up on getting work. I've used Avid, Final Cut Studio and am dabbling in Premiere. Of those three, I like the old FCP Studio the most. Haven't had much opportunity to play with FCPX, and I don't care much for Premiere, but it's now a decent enough program that people won't laugh at you for using it like they did ten years ago.
As a student, you can also get a sweet deal on Adobe software, but I would plan it out and buy right after a new release (6.5, 7, etc) as you can't upgrade edu versions. But at least you can use them for work (depending on your region).
If I got the Creative Cloud with a monthly subscription I'd always have the most updated Master Collection, but yes at this point I would wait for 6.5 if I were to buy. I use FCPx mostly now. I did use FCS for a bit and learned on that. I like FCPx, it's not perfect, and do prefer it over Premiere. Plus I don't have a Nvidia GPU, though could have won a K5000 GPU via raffle for my Mac Pro. Oh well. Never really used Avid or Smoke.