WEP isn't as secure. It's been cracked some while ago. Depends if you have malicious geek neighbours as to whether that's important to you!
The other alternative is a Squeezebox and Real Rhapsody (rather than Napster, if it's available in your country - it's not yet in the UK). Under £200 at Amazon now. I believe that operates WPA though anyone reading this should check.
The thing that's hindered me in doing all of this is that N devices are likely to be emerging in the coming year and from an audio perspective, these are likely to be superior since they will be less prone to dropouts. I believe that for this reason, a Squeezebox or Pinnacle revision can't be far away - Until then, I'm sticking with my (WPA enabled) Airport Express.
I don't know if the Netgear units do Playsforsure. They look nice.
http://www.dabs.com/productview.aspx?Quicklinx=48SL&SearchType=1&SearchTerms=netgear+media&PageMode=3&SearchKey=All&SearchMode=All&NavigationKey=0also, a lot better;
http://www.dabs.com/productview.aspx?Quicklinx=4FWL&SearchType=1&SearchTerms=netgear+media&PageMode=3&SearchKey=All&SearchMode=All&NavigationKey=0It also has the advantage that you can plug your ipod in to it and it would read it as a stoage device digitally rather than as an analogue source. They're upgradeable to WPA if you upgrade the firmware after you get it. I can't see a Playsforsure logo but that's not to say that they don't. They're still not N compliant though and I don't think we'll see a device that is until at least the Apple TV.
Incidentally, these subscription services are awful for classical music. It would be an attractive alternative to DAB radio if one of them could get that right.