BTW I'd prefer you didn't leave your GF in Langford whilst you deploy. It's not terrible but I'd feel safer with her somewhere like some of the smaller units I listed.
I'd probably go Lynwood before Langford. It's a small step nicer
Here are my picks for your budget
http://www.realestate.com.au/property-house-wa-lynwood-119667995
http://www.realestate.com.au/property-other-wa-lynwood-119512867...