How can I force specific devices to use a specific Airport Express?

I have an Airport Extreme router on the main level of my three level house. I have a 1st Generation Airport Express on the same level, extending my wireless network and acting as an airplay device.
I have added another Airport Express (2nd Generation) in my basement to be close to several wifi-ready devices (Wii, AV receiver, Blu-ray player). How can I force these particular devices to connect to the new and 'closest' device, just 20 feet away? Some, but not all, are connecting still to my Airport Extreme with a 'good/average' connection. Specifically, I'd like to force the blu-ray player to use my new Express, to eliminate buffering on my blu-ray player (Vudu - movie rentals).
Suggestions?

It might help to remember that the AirPort Express...or any other "extending" device....can only extend the quality of signal that it receives.
So the trick is to get the best signal possible to the extending device......and also....have it provide a good signal for other devices. It's a compromise at best with the best location for the "extending" device about half the distance between the main router and the devices that need more wireless signal.
This assumes no major obstructions in the signal path.....and unfortunately a floor/ceiling is a major obstruction....often the thickest barrier in a home.
Unfortunately, users tend to locate the extending device where they feel that they need more wireless coverage....in a weak signal area....and then the extending device receives a weak signal and extends that weak signal quality. The result is little or no improvement at all.
It is going to take some experimentation to find the best compromise if you want to extend using wireless only. Even a good connection results in half of the bandwidth being lost, so you might want to think about a "Plan B" in case wireless will not deliver the bandwidth that you need.

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