It depends how much you want to spend. You only need to replace the digitizer + glass. This will require careful separation between the glass and the LCD. If done improperly you can risk cracking / damaging the LCD. If you want to play it safe, you can get LCD + Digitizer + Frame for $20-$30 more.
You can get the part for just digitizer + glass + screen adhesive from here: http://www.ebay.com.au/itm/New-Nokia-Lum...
If the LCD does not display any more, then the LCD has gone bad too which means you will need to order at least the digitizer and the LCD.
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