I currently have an HR20-100. Have a 1.5TB AV hard drive in it. Recently replaced the fan. Still running at 130 degrees. How hot does the HR24 / AM21 run? BTW, you still need the b-band converters for the HR24, correct? Does the AM21 have any quality / performance issues vs. the HR20's built in OTA? Is the integration seemless like it is with the HR20?