Never used a wireless expander so I can't help on that part of it. But I will tell you my preferred setup...
DD-WRT compatible routers. I use some WRT54G (2,2.2,1) each with 250mW radio's. Set them up for WDS and use where needed.
Even just the free antenna solves most problems.
What is the environment you are setting up in. Some well placed antenna's might do the trick.
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