Fannella I do not have property in Armadale but I can give you a bit of a run down. Lomas and others have been flogging Armadale for years without success. The prices jumped in 2006/7 and everybody was a hero. Since then the prices have slowly inched up or gone nowhere. I do not think you could buy a house for $250k. Be aware it is one of the worst suburbs in Perth, high crime and race problems. People have made money there and will continue to BUT it looks much better on the internet than it does in real life, I would take a trip there and check it out rather than buying sight unseen. For the budget you have there are probably more options in Qld. Hope this helps.
