Help me choose which speakers to buy

No being a wise-ass, I seriously suggest you spend a little more. If I were you I would wait around for Reference 3A DiCapo's. I saw a pair last week for $650. Sweet, detailed, and very open. What are you using for an amp?

Monitor Audio have some good sounding speakers at a good price

Ive read some good things about the PSB Alphas... Any thoughts to support or diminish that suggestion?

I would like to put in my 2 cents. For $150-$200 you can pick up a used pair of Energy C-2 (the older model). For the money they are unbeatable. They were on Sterephile's class C recommended (monitor series). They sound much better than B&W
s DM series (601s, 602s) that cost twice as much. Good luck.

A used pair of NHT SB2s might be found in that price range and could be just the ticket.
They image beautifully and the sealed design offers a tight fast delivery. Easy to place with a a
decent amount of bass too.
That's just my opinion.
Good luck.