This is another option, one that I would go for, but it may not be for you.
First, you have an outstanding set of stereo speakers. To get the best sound you will have to pair them with with good, and probably expensive, power. That being said, you will get great sound from all the suggestions you've been given so far. My suggestion would be to find a good used Rotel or NAD integrated, making sure it has a good pre-out for future expansion. I suggest Rotel because, even though I've never owned one, I've read many times that Rotel and B&W do well together. I've had many NAD amps and think they are the best in the mid-fi arena. An integrated will give you good value over separates.
With this suggestion you will get a great music experience. These speakers will give you plenty of bass for music. Again, you can decide later whether you need a sub for movies. The drawback will be you won't get a surround experience. For some, like me, that's not a concern as I go strictly two channel stereo. Of course you can always add that later.
I would also tell you that I recently bought a refurbished Onkyo RX-8522 stereo amplifier. You can pick these up on e-bay for under $150. I bought it just to try it out as I'm always looking for low cost options. I find this to be a very good unit and, at 100 wpc, would power your B&W's nicely. This would be strictly a stereo option as the unit doesn't have a pre-out and you would not be able to expand later. It would, however, give you a very good stereo experience and makes an excellent choice for a secondary system in the future.
I envy you sir. Good luck with your good fortune.
John