They all sound really interesting, and I want to pick a good one to give too, but unfortunately I don't really know anything about any of them.
As it is now there is a huge cognitive barrier to completing registration. I want to give, but I don't know whom to give to. I could complete the registration by facebook/twitter, but I can afford to give a little bit and don't want to go the free route.
I came close to closing the tab, thinking I would come back later, but I also know I might forget and I don't want to miss out on what looks like a great con!