What memory should i get?

[Littlesans]

gigabyte z87x-ud3h that what i've got

More than 2100mhz
£70-£80
2x4gb

What ones should i get? And why... Gonna be ordering them in a few hours time

 

[Littlesans]

Avexir Core Blue Series 8GB (2x4GB) DDR3 PC3-19200C10 2400MHz Dual Channel Memory Kit (AVD3U24001004G-2CI)

will that be ok for this motherboard?