What is a good internet provider for Australia, perth?

I had BoB from ii Net but it was vey bad, It was always laggy, they always had issues at the HQ, and eventuly I just didn't have it, it got cut off from an overcharged bill from them stuffing up yet again, it just isn't good. Now I need new internet. I only use it for xbox live so I need a good reliable provider that doesnt have lag, there there will proberly be 3 iphones 2 xbox's and 1 computer, not at once but they are the devices that are in my house.