Jos A. Banks is a good store if you hit the right sale. Last year I bought 3 suits, 3 shirts, and four ties for around $1k (after paying for alterations and a permanent crease). The deal was "buy one suit, get two suits free, plus 3 shirts." The ties were buy one get one free. The highest priced suit was about $800. I'm very happy so far with the quality. Plus now that I've shopped there once and joined their buyers program, I get frequent discount coupons in the mail ($25 off any purchase over $50 usually).
If I were just buying a single sport coat I'd probably look at Mens Warehouse.
Yeah, Mr. Bank is a great place to build a wardrobe quickly. That's what I did. Also, they make the only casual dress khaki that fits my build.
Cynical Chief says everyone looks the same in a monkeysuit anyway, so why worry if somebody else got their monkeysuit from the same store?
Well, wearing the same suit probably wouldn't be noticeable. Wearing the same patterned dress shirt stands out a bit more.