There are several Usher Be-718s (aka Tiny Dancer) available in your price range. They should satisfy you in terms of soundstaging and bass capabilities, and although they'd probably open up a bit more with more power I'd be surprised if you were unhappy given your stated preferences.
Also there are a few pairs of Silverline SR17s available as well, and they will also throw a wide and deep soundstage and probably be fine in the bass department as well.
Both of these manufacturers are well respected, and if it turned out they don't work for you you could sell them with no/minimal loss. B&W certainly makes good speakers, but given your stated preferences I'd go for one of these first. Proac is also a good choice.
One note, if you're really looking for a deep soundstage you'll need to pull your speakers out at least a couple feet more. With monitors it would be relatively easy to pull them out for listening and push them back when you're done, and that'll really let a good speaker open up quite a bit more. Once you try it you'll never go back.
Best of luck.
Also there are a few pairs of Silverline SR17s available as well, and they will also throw a wide and deep soundstage and probably be fine in the bass department as well.
Both of these manufacturers are well respected, and if it turned out they don't work for you you could sell them with no/minimal loss. B&W certainly makes good speakers, but given your stated preferences I'd go for one of these first. Proac is also a good choice.
One note, if you're really looking for a deep soundstage you'll need to pull your speakers out at least a couple feet more. With monitors it would be relatively easy to pull them out for listening and push them back when you're done, and that'll really let a good speaker open up quite a bit more. Once you try it you'll never go back.
Best of luck.