Does it matter which I choose? Would it be smarter to do 100k just to see if I can handle it or the US Champs?
Also, I've been looking through this website:
http://www.ultramarathonrunning.com/races/usa.html
There's a TON of ultra races, the only problem is I don't know where to look to find a competitive, larger-scale race. Does anyone have any decent suggestions. I would hate to fly all the way to Cali or Florida to find some 50 miler being hosted in someone's back yard.