I tend to go between the more conservative business type look to the edgier Rock Star side of fashion. You can easly flow back and forth between them, and blend them in interesting ways. I'll shop in both the Preppy and Urban style stores, but I don't know as much about those styles as I just don't feel comfortable in them, especially the baggy Urban/Hip-Hop style. I do still window shop them on a regular basis both to see any trends that might be interesting, and the occasional article of clothing that does fit my personal style.
I will buy stuff that grabs my attention from whatver store it is (as long as it's not expensive. Sales are your friends.

) I *have* invested in some quality clothes, including a fully custom tailored suit and shirts, leather jackets, and nice jewelry. I also feel fully at home combining that tailored suit with a $10 t-shirt and bracelet from Target, sneakers from Sketchers, and a belt buckle/belt from a mall kiosk stand.
Here's a breakdown of some of the places I look in regularly, along with where I think their clothes typically fit into my personal 4 main dress "styles". You should be able to find all of these stores between Northpark, Valley View, and Galleria malls.
Edgy - The Rock Star look
Metropark
Express Men
Macy's
Oakley
Buckle
Hot Topic
Old Navy
Target
Preppy - Fratboy chic
Macy's
American Eagle
Ambercombie (& Fitch)
Hollister
Aeropostale
Old Navy
Target
Ross
Conservative - Blazers and striped button down shirts
Bachrach
Macy's
JC Penney's
Target
Urban/Hip Hop - Baggy and blingin
d.e.m.o.
Target
Ross
Store Price range and short descriptions
Aeropostale - $ to $$ - Mainly preppy stuff, with small selection of accessories and good sales for jeans, etc.
Ambercombie (& Fitch) - $$$ - Frat boy (and girl) spring break shopping heaven.
American Eagle - $$ to $$$ - See above, but cheaper. Decent selection of bracelets, belts, etc.
Bachrach - $$$$ - Edgier side of business apparel, shirts, shoes, and suits. Some nice stuff if you can afford it.
Buckle - $$ to $$$ - Similar to Metropark, slightly cheaper.
d.e.m.o. - $$ to $$$ - Urban styles, baggy jeans, bling jewelry.
Express Men - $$$ - Good for seperates, blazer jackets, and pricier jeans.
Hollister - $$$ - Ambercrombie by another name.
Hot Topic - $$ - Edgy/rocker/goth/punk/etc. Great for funky t-shirts that are affordable.
JC Penney's - $$ - Middle of the road, conservative. Occasionally some nice stuff can be found, and good prices during sales.
Macy's - $$ to $$$$ - Wait for th ebig sales, then check 'em out. Good all around selection in the bigger stores.
Metropark - $$ to $$$$ - Great place to scope out edgy tees and accessories. Make sure to check out the sales rack in the back.
Oakley - $$ to $$$$ - It's Oakley. If you like their stuff, only place to go.
Old Navy - $ to $$ - Good t-shirts and jeans for cheap.
Ross - $ - You'll have to hunt, but diamonds in the rough can be found in any style.
Target - $ to $$ - Great all around place, and you can put together some damn good outfits on the cheap.
Walmart - $ - Chicks won't know where you got your Hanes boxers or socks from.
