Get the F-1N (aka New F-1), for the brighter viewfinder and readily available batteries. (Unless you don't plan to use the built-in meter, in which case you can go with the F-1n, which has a fully mechanical shutter so you can go without batteries, as opposed to the electromechanical hybrid shutter on the F-1N.)
Almost all of the FD prime lenses are simply great. I generally prefer the new-FD (FDn) lenses, which have a more convenient bayonet mounting action and are sometimes smaller, but the earlier FD "breech-lock" lenses are, for the most part, more solidly/heavily built. A few of the zoom lenses are also great, but most of them don't stand up to modern zooms.
I've used the following lenses: 24/1.4L, 24/2.8, 28/2, 35/2, 50/1.2L, 50/1.4, 50/1.4 SSC, 50/1.8, 85/1.2L, 85/1.8, 135/2, 135/2.8, 200/2.8, 35-105/3.5, 70-210/4.
All were amazing, except the 50/1.8 which was merely good, the 135/2.8 which was mediocre, and the 70-210/4 zoom which sucked.
I still have 3 well-worn F-1N bodies and a bunch of lenses and accessories, but they haven't tasted film in about 4 years, so I should probably let it all go. 🙁
Enjoy your new entry into a great classic system!
Oh, and another note: If you have a Nikon system already, there may be some getting used to the Canon system, as I think the focus and aperture rings turn in the opposite direction. 🙂
Cheers,
::Ari