I think your choice of DS Lite > DSi was smart. I have a DS Lite, and considered a DSi. But, DSi just isn't convincing enough. The DS Lite also has much longer battery life than the DSi. It still has the GBA slot, and it has wifi just as well. Also, if you're into glossy interfaces over "matte" style, DS Lite is the better choice. And as for your question pertaining to the size of the DSi screen...no...it is not much bigger.
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