cisco aironets are good if you are able to configure them properly and have the cash to spend, but its really not worth it.
http://ncix.com/products/index.php?s...ufacture=CISCO
gets my vote, i bought one of these to replace an aging linksys access point in our office, signal strength is excellent.
you may also want to consider something like this:
http://ncix.com/products/index.php?sku=46594&vpn=DWL%2D3200AP&manufacture=D %2DLink
Basically a cisco aironet knockoff.
edit: the d-link isn't 802.11N though, and it may be PoE only, which would mean you'd have to buy a PoE injector as well. The cisco(linksys) one above is PoE but also comes with a regular power adapter.