CUB, generally Wireless broadband and online gaming don't go hand in hand as there is a fair degree latency (time between when a packet is sent and received) and the download limits are paltry compared to ADSL. If the online gaming is not unmetered then you will be up for a very expensive internet bill.
Here is a link to the best independent broadband information site in Australia. The Broadband choice database there is excellent to let you know what services are available in your area.
http://www.whirpool.net.auLet me know if I can help any more.