Upgrading system need help choosing mother board

I am planning to do a system upgrade but I am not sure which mother board I should get? The one below are the ones I think are suitable but I want to know the difference between them especially between the 2 ASUS mother boards.

Asus P8Z77-V-LK
http://www.umart.com.au/pro/products_listnew.phtml?id=1...

Asus P8Z77-V_LE_PLUS
http://www.umart.com.au/pro/products_listnew.phtml?id=1...

Gigabyte G1-SNIPER-M3
http://www.umart.com.au/pro/products_listnew.phtml?id=1...

Gigabyte GA-Z77X-UD3H
http://www.umart.com.au/pro/products_listnew.phtml?id=1...

Asrock Z77-EXTREME4
http://www.umart.com.au/pro/products_listnew.phtml?id=1...

The system I buy includes:
Intel i5 3570K (Ivy Bridge)
G Skill 8G(2x4G) (CL9D-8GBRL)

I am planning to go to 16Gb in the future.

Any information will be helpful thanks.