Some houses in the west that suit your budget:
http://www.realestate.com.au/cgi-bi...r=&cc=&c=25000807&s=nsw&snf=rbs&tm=1219992753
Not a well known suburb in the northwest sector but close to rail and heaps of new infrastructure eg: Rouse Hill, Schofields resi dvpt. Rents are good too.
http://www.realestate.com.au/cgi-bi...r=&cc=&c=25000807&s=nsw&snf=rbs&tm=1219992753
Another cheapie area that's on my watch list for value. Just like all suburbs there's a good and bad side. Do your homework.
http://www.realestate.com.au/cgi-bi...r=&cc=&c=59556795&s=nsw&snf=rbs&tm=1219993046
Ok the "gran" flat isn't approved but is a converted garage but still... with a good position and some slick negotiating (this one's been on the market for a while now) you could do worse. Not too far from rail. Could do with some value add.
And if you're more inclined to units, there's just too much to choose from. However, with $450K to spend, I'd consider the following a small sample of the plethora of choice available to you:
http://www.realestate.com.au/cgi-bi...r=&cc=&c=61637567&s=nsw&snf=rbs&tm=1219993239
Stanmore
http://www.realestate.com.au/cgi-bi...c=&c=52406936&s=nsw&snf=ras-syd&tm=1219993530
Fantastically positioned Waverton- your money will get you a decent 1bedder or very rundown 2- but go for something with parking. Walk to rail.
http://www.realestate.com.au/cgi-bi...c=&c=52406936&s=nsw&snf=ras-syd&tm=1219993530
Busier rd but what a spot!
http://www.realestate.com.au/cgi-bi...r=&cc=&c=57230250&s=nsw&snf=rbs&tm=1219993791
West Ryde
Way too many suburbs to list but you need to get out there and start narrowing it down.