I would recommend replacing the whole display. The LCD in a display by itself usually is not much cheaper than the whole display. Sometimes it's hard to find only the LCD alone. Also are you sure the digitizer wasn't damaged? The digitizer sits between the glass and the LCD and controls touch function. If you are unsure if the digitizer is damaged then your best bet would be to replace it all. Also replacing the whole display is way easier then trying to separate the parts of a touch screen display. Especially if your glass is cracked badly.