Jos. A. Bank is having a sale right now on their "Separates" suits. They sell the slacks separate from the jacket, which is good, because unless you wear your jacket 100% of the time, your slacks will wear out first. Around $210 for jacket + pants without alterations. I almost bought one myself tonight, but then I decided to stop by the B&M store nearby work.
My best suit is from their Signature line, but it's also my most expensive one ($300 or $400 on sale IIRC).
I also have suits from Marshall Field's and Carson Pirie & Scott. About the same quality and around $250 each.
I didn't really like my suits from Kuppenheimer.
Tailoring is pretty expensive, so remember to factor that into the cost of a suit.
Dryclean only. Sucks. Expensive. I get the slacks cleaned every third or fourth time I wear it, and the jacket every once in awhile. I only wear the jacket on the way in to work, when I meet with clients (not very often), and on the way out. When I get more suits, I'll increase the cleaning frequency.
BTW, I find it completely unfair that women at my work don't have to wear suits too.