Hello, I'm in the market to buy a DS (first one) and am still having trouble deciding whether I should buy the lite or dsi. One of the most important things to me is battery life (as I'm constantly traveling (flying) for work), and I read that the lite has WAY better battery life then the dsi. However, I suppose I'm willing to make the sacrifice if the build and screens of the DSi are leaps and bounds better than the Ds lite. Thing is, I also remember reading that flash carts (which I will be using a lot) drain the battery more then a regular cartridge. If thats the case, will I be getting even LESS battery time then the standard 9-14 on lowest setting with the Dsi? Because if I'm gonna be getting less then 9 hours on even the lowest bright setting, the DS Lite seems to be a better purchase, as some of my flight are in the 10 hour range alone. Please let me know what you think guys.