I'm planning on a rig with multiple RX 480's, but I need some information.

I am planning to build an Ether mining rig with 3 RX 480s, but the choices of what brand to use seem overwhelming. I want to choose a cards that can do somewhere between 25-30 MHz per card. So far I have considered The ASUS 4GB Dual fan OC 480, but are there any other better options for the money? Does anyone have experience with this particular card? And how big of an impact does the amount of VRAM have on mining performance?

Thanks in advance.