I don't know which to choose as well. Really the XL looks like a brick, and it reminds me of the Xbox 360 power brick i have in my room, and i don't want another! The big screens haven't impressed me, and they don't matter much. Remember the GBC or the original Game Boy, they didn't need big screens to be popular and have fun, the GBA SP screen is big enough for me, and considering the DSi screen is bigger, it should be fine. And besides the DSi XL is 300g, i have a psp slim which weights 200g and it's heavy enough, and the screen, it didn't need to be this big. Anyway have you seen any pictures of the DSi XL, it doesn't look too ergonomic. The DSi reminds me of the good old days of GBA, GBC and GB, in size and style, and i want to relive those glorious days again with the Nintendo DSi. So for me it's between the DSi and DS Lite, but i think i'll get thr DSi.

Hope i helped you.