I got a Garmin a little while ago and wasn't happy - granted it was a base model but i spend 200 and it wouldn't pick up signal in the areas i was deer shooting....so i purchased a Magellan Tritron 500 online - very very happy, holds signals and didn't cost an arm and leg...small and compact too.
Garmin in australia have more availibitly for topo etc - but magellan is defentily worth looking into - my brother has had one for 10 years and still works really well.