I went to Wal Mart just the other day to get a wireless device to use on our school network ($80) I finally settled on the Netgear N600 which is wireless N too. Keep in mind that wallyworld only keeps the consumer devices, I should have known better to get one there.... but I couldn't wait to order one.
Everything was fine up to a point with the setup. It only wanted to stay on the class c subnet (192.x.x.x) while we are on a class a subnet (10.x.x.x). This was doing a manual setup using the web browser to program it. I never could get it to go, no matter what I tried.
So I popped in the good ol' CD that came with it. Not going to work this way either

It finally shut down after it told me I was on a domain and therefore it couldn't help me. GRRRRRR!
so now I will have to order a business grade model and wait a few days before it gets here.

sorry, I don't have any "good" recomendations for you 40hz. Just keep away from the local discount stores for your purchase.