Hi, I am a newbie so this may be a really stupid question. Verizon sells the MAXX for $100 more than a regular RAZR (regular battery, 16GB). It seems like I could buy a regular RAZR and add an aftermarket extended battery & 16GB microSD card for a lot less money (even more as I am not sure I need the addl 16GB, I would probably wait until I used the first 16GB to buy the card). is this a bad idea? Thanks!