Enyewe telling you the truth,for a tiptronic sub impreza we are talking about a 2002 and above model and if you are extremely lucky and 2001 model. For these cars,unless you are getting a thoroughly beat (meaning 'imechapa' if you understand that sheng),be prepared to cough up above 550K.
For that kind of money you can get a sub impreza 1998 or 1999 make which is definately not tiptronic,or tafuta Toyota 110 1999 or 2000 model.