Another option, though more expensive, is to use a wireless bridge. The idea is that you use another router, like a Linksys WRT54GL running a 3rd party firmware like Tomato, and have it do the heavy lifting.
Here:http://www.newegg.com/Product/Product.a ... %20wrt54gl
Of course this option doesn't make use of 802.11n specs, just 11g. For 11n you might be better off just getting a new router:http://www.newegg.com/Product/Product.a ... 6833162031
But that would just be nuts.
Calm seas never made a skilled mariner.