Oh oh oh oh you are SOOO lucky! Are you getting a stand/filter/hood with the tank, or just the tank itself?
You have a tank which is big enough to house some of the slightly larger (but not too lage) fish out there so you might want to consider the great opportunity you have to buy fish like gars (alligator, needle-nosed), clown loaches (most ppl with smaller tanks get them anyway), bichirs, eels, freshwater barracuda IF you're into something different.
However, I'd think the best way to go might be to get some discus!! Get your pH down to 6, and take advantage of the space to give them the room they deserve.
Also, a 100 would make a really kickin' cichlid tank, especially African. If you were to make a biotope, you might have a really impressive Lake Tanganyika or Malawi tank. Really consider this, because this will be very rewarding. There are some catfish in these lakes, also, which would fulfill the bottom-feeder roles in the tank.
Also, you could get a or several black ghost knife(ves), and have a really interesting species tank.
That's enough for now. I'm excited for you!

Good luck!