I had a Cisco USBBT100 with the Broadcom chipset which worked great, but it was borrowed. The USBBT100 worked great with BT4 and BT5 natively or in a virtual machine and even worked with Windows XP. I went to purchase another but found that the USBBT100 is no longer widely available and the Cisco website is unclear on whether it is being distributed.

Is there a particular USB bluetooth adapter that is spot on for BT5? If there is no particular adapter, is there a particular bluetooth radio chipset I should look for?