I guess I should post since I was sumond...
B&W are hard to find subwoofers to match with. But, what I can say that a book shelf is a lot easier to match with than a floorstander.
Anyway, my recommendations as usual is to go out and listen to stuff and buy from a reputable local dealer that you feel comfortable with. You might spend a bit more money but you won't regret it in the long run.
At this price range you might be better to DIY your own subwoofer with something from several of the car audio companies. It is very hard for me to recommend things at this budget range, however there are some learning rules of thumb.
1) Don't skimp on the speakers. Spend about half your budget on speakers. Also, if you don't have enough money for a 5.1 system don't get it. You can always add loudspeakers later to complete the system when you have money.
2) Make sure you get a decent enough receiver/processor with enough power to driver you speakers. I have seen people get 200 Watt loudspeakers and try driving them with 70 Watts of power. Doesn't work, a good dealer can help you make this choice.
3) Get a good source. With the digital age the Crap in Crap out isn't as true as it used to be but it still is very true. Oppo makes some fantasic units, and if you want to use BR or HD there are plenty of options for you that way. The PS3 makes an AWESOME BR player plus it is a kick *** game console.
4) Finally, don't be afraid to tell the stores you visit your budget. (By store I don't mean Best Buy or CC) Most of the guys who work at Hi/Mid-Fi stores started out as kids who wanted an awesome system and grew into men who work in a toy shop. //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif