Alright, price conscious smart casual, business casual clothes are easy to find if you know the right places. Yeah, this may sound a but metro or whatever, but seriously, dressing well is a skill that can get you places.
Just Jeans
Despite the generally wanky stuff in the window, there's gold in here. Prices are often slashed- just like jayjay's (They're part of the just group). Picked up some awesome pinstripe trousers here, sturdy and comfortable as. Should be easy enough to get a pair of good cut Levi's from here.
Myer
Covers all the bases, again, good specials around sale time, the staff in my local one are ace.
Cotton On
Not so great, a bit teenage, but I have a cotton sweater thing from here a few years back- warm, cheap as, fits well, passes all dress restrictions if you ever go out somewhere swanky.
Roger David
Bit more pricey, less so than Tarocrap though. Good, anonymous looking stuff.
Kmart
Yeah, it's a cheaper department store, but the "Rivergum" branded shirts come highly recommended from me. $30 each or so, and you're set.
DFO's
You're in Western Sydney, surely you've hit them up. Good stuff, cheap prices, lots of selection, one location.