It is hard to recommend any over any others - Nearly all modern wireless adapters that are on the market right now (especially N based devices as these are newer) are fully compatible with Windows 7.
If you want to spend a bit extra, look for the made for / compatible with Windows 7 logo... Generally these are a bit more expensive as testing costs money, but you are guaranteed that it is fully compatible in any/every scenario. (x86 and x64)
Although, personally for me, for home machines, I just look for the cheapest place that has a Realtek chip on it - nearly all wireless cards from unknown manufacturers contain one of a handfull of reference designs and I have never had a problem with the Realtek ones*.
*In Windows Vista, the built in driver is rubbish and broken at connecting to WPA2 based networks - I always have a copy of the latest version (unbranded and direct from Realtek) available on my usb stick. Even though Windows 7's built in support is better, I would still use the newest version from their site.