I'm also looking for a Bluetooth receiver so I can connect my iPods and friend's phones to my 2-channel system and listen to portable playlists. I was all set to order the AudioEngine B1, but found the NuForce BTR100 for just over 1/3 the price of the AudioEngine. Both support aptX codec and AAC for improved fidelity over standard Bluetooth. Both get very good reviews.
You can buy a Bluetooth receiver for as little as about $20 on Amazon. However I'm going to forego the cheap route and go with a mid-priced model that has the upgraded codec and hopefully better build quality.