Cracked screen with lower half responsive

Hi guys,

My Xperia Z was knocked on to wall with its corner.

And there's a crack inside the phone.

The outer glass/screen is not cracked, its the inside.

Cracked hairline area aren't responsive, but lower half ( non-damaged area is able to respond to touch )

I've seen the repair guide for XZ in this website, and the guy is only replacing one part ( touchscreen and lcd display? ).

I'm not sure which parts should I buy to replace the screen myself.

Front LCD Display Screen+Back Cover

Touch Screen Digitizer

Or should i get this full set, which is expensive?

[http://www.amazon.com/Sony-Xperia-Displa...|Full LCD Display+Touch Screen Digitizer

Or please advice on the parts.

Thanks.

Regards