Thanks Major and Silverflame for the quick replies. I think the only reason I'd want the SP is for the better lighting (I've used the GBA before, and its darkness got kind of annoying). So here's the specific question: Is the better lighting with the SP worth 30 bucks?
Also, I won't use it all that much; pretty much just whenever I go on trips (and maybe whenever I'm bored, and the computer isn't available), so it's not like this new gaming system is going to be very important to me. I think I'll get the regular GBA, since the lighting isn't all that annoying, IMO, unless ya'll convince me otherwise.