1) There's no such thing as a crappy Benchmade knife, period.
2) This goes for the Balisong. It's got titanium handles and a 440 stainless blade; the pins that retain the tang to the handles I believe are also titanium. I can't imagine snapping a Benchmade Balisong unless you decided to use it to pry manhole covers open or something.
3) I'd have to check to be sure, but I thing Benchmade guarantees their product for life, so it shouldn't be a concern anyway.
4) If you're a novice to the Balisong, I agree that getting a decent-sized cheapo with a not-so-sharp blade is the way to go. I can tell you my Benchmade was sharp enough to shave with out of the box, and I nicked my fingers up good a couple times when I first got it (mind you, I'd been twirling butterfly knives off and on for about 20 years at the time). Benchmade makes training blades also, which I think you can remove and replace with the real deal later (again, I'd need to check to be sure).
5) there's a guy who started making good quality, low-cost butterfly knives a year or two ago; I bought a couple for gifts, they're good and only about $30. I'll see if I can find out who he is and post a link.