Shoes: Allen Edmonds Shoe Bank
http://www.shoebank.com
Shirts: As much as I like my Brooks Bros shirts, I find those from Jos A Bank to be very competitive. I think that the Traveller Tailored Fit are their best ones and they can be had off the website for short money.
Drop a a little more on shoes and a bit less on shirts...then we can talk trousers!
+1 I have a few Jos A Bank shirts and they are good quality for the money - they are almost always on sale buy one get two free (which puts them in the $29 range). They have both tailored and slim fit. Their regular fit is huge.
If at all possible don't buy cheap shoes.