I play in Tasmania as well and can comfortably roam. I have NBN so my ping is 250-260 in PvE and 270-280 in WvW, but stable and doesn't get much higher.For high ping, you may not always be able to instantly react to burst builds and 1shot deadeyes etc, so you may want to play more suvivable builds.Power DH is a lot of fun and I pulled off outnumbered fights successfully on it, as well as core ele, weaver, druid, spellbreaker, scourge and holo.Mirage and Thief are difficult to play on with high ping due to teleport-skill delays, that blink you forth, back (for 0.25s) then forth again (on the screens of anyone except you, it will appear normal for you but you're vulnerable to attacks), and the low armor/HP base on the meta power gank roaming builds. I can say that there are times I often rage aloud like "fck woulda had that if it wasn't for 250 ping" when I miss a dodge by 0.1s, but it doesn't stop you from being able to roam. You will get used to the high ping and it won't affect you much, you just have to cast skills earlier, e.g. press 3 while 2 is halfway through casting, then you won't waste any time. And remember to dodge just before something hits you, as getting hit mid dodge means you dodge too late.