Ok, so I see that you are 30 now. Its time to start dressing like a man... so try something different than A&F, American Eagle and Hollister. If you want great dress shirts that are fitted for in-shape guys try Calvin Klein Slim Fit or BCBG//Attitude Modern Fit shirts. The cut of the shirt flatters athletic/fit guys and you will stand apart from the typical guy that wears those awful baggy box cut dress shirts to work. You can get them at nicer Macy's stores in urban centers.
For jeans, I would go for Levi's and get some 514's slim straight fit or 527's boot cut. These are low rise, but not so low rise that they are ridiculous, and they do a great job in showing off your butt. www.levi.com
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For dress pants, Banana Republic is a safe bet, but pricier. For great khakis get a pair of Dockers Straight or Slim fit at JCPenney. Don't buy Classic or Relaxed fit Dockers - those are for your Dad.
If you need ties, that is something you don't need to shop at an expensive store for. Go to Nordstrom Rack or Marshalls. You will find the same brand names there that you will in department stores for much less.