No, that is not a good reason to buy a DSi. One if your
Ds is causing your pockets be heavy then I would suggest buying a case. Now if you really want a DSi I would have done this. I would have traded in my
GBA and
DS Lite to Gamestop when they were running the special. Your
DS Lite seems fine to me. I would sell your
GBA to get money for a DSi if you deaire to buy one.