i would take one slide film, one C41 and one B&W. i love velvia 100F but you say you have 100, so i am not sure. you can not go wrong with any of them. flip a coin.
80 sheets sound good, maybe 50 sheets B&W and 25 each for color and E6. . the x ray should not hurt the film. ask for a hand check....better yet ship it ahead to yourself. i use the USPS priority mail. ship it to "your name" at whatever PO you will be near. you can find a PO at USPS.com. you can use delivery confirmation and will be able to verify it has arrived before you leave....just in case. i have done this with my film and 2 LF cameras with great success.