I've already linked to Paul Fredrick a couple of times, and expect me to do so frequently. Every single one of my currently-in-service dress shirts, except for a Jos. A. Bank non-iron that I save for emergencies, is from PF. I don't ordinarily buy from them except for the clearance section. The two shirts in The War on Stains, Part 1 were not clearance but were on sale for 20% off.
However, PF is absolutely clutch if you are in need of some serviceable, quality dress shirts and have never shopped PF before because of this coupon code, which changes from time to time but reliably can be found in The Atlantic or Esquire:
Plug it in, and you can get up to four of their white "Pinpoint Oxford1" shirts in either French cuff or barrel cuff2, in any number of collar styles, and in regular fit or trim fit for $20 each. This is such a tremendous deal that it makes me want to use the "blink" tag.
I recommend that at least one be a straight3 collar and another be a Windsor4 collar with French cuffs so that you can know how good it feels to wear such a shirt but also decide whether you prefer straight or spread collars. The other two (and I insist that you order four--you only get to use the deal on one transaction) are up to you. PF has many collar options that you can't get at, say, Jos. A. Bank.
1. A type of cotton weave. It is durable, a little bit sporty, and slightly coarse but more than nice enough to wear with a suit. Think the material that a typical Polo button-down shirt is made from. The next step up is a finer weave called "broadcloth."
2. The typical dress-shirt cuff--not folded over itself; one or two buttons. No freestanding hardware required in order to keep it closed.
3. Also called a "point" collar.
4. Also called a "spread" collar.