Outdoor Client Bridge/Access Point

[BCScott]

I'm looking for a way to increase the range of my wireless set-up around our small resort. I think the best way would be an ethernet connection from our cable modem to something like this: http://www.engeniustech.com/datacom/...ory.aspx?id=17 , an outdoor access point. TD has them for $160-$270. The problem is, despite these being available for a couple of years, there aren't many reviews available. The one that I've found says durability is a big issue. I've read that durability is also an issue with EnGenius long range phones.
So in short, what I'm looking for is a means to give wireless internet access to our guests, with the furthest cabins being 400-500 feet from the modem. I don't want to use "Draft N","Pre N", or "N" yet as most people still have 802.11b/g wireless cards and I'm looking for the widest acceptance.
Thanks.