Even though a lot of people are saying stick with the DS Lite, I'm sure some of them are quite hypocritical about it. I know I'm eventually gonna get a DSi, since it IS more versatile than the DSL.
I'm sure the shoulder buttons won't screw up on them as quickly either.
And when I do get a DSi, I'm gonna make sure I'm gonna smack on some screen protectors the first time I open it.