I went ahead and got every ending, because this was a great story and I really wanted to see how it all pieced together. I like choose your own adventure books in general, and this one was really well done. It's also a cool concept for time traveling, because you get to go through and see how things could be different a lot more than with just a linear story. It's hard to say what my favorite ending is, but typically I like it when future Todd ends up better off, either because Todd directly steps in for him or because he learned on his own he should be a better person.
Anyway, I'd like to see more from you, because this was really good! It's probably the best thing I've read in quite a while. Honestly, I don't know what kinda job you have, but I think you're a really good author and could probably sell stuff you write pretty well.
Oh also, UO shirt! nostalgia'd.