I have had all three, and currently own 2 HR21s and 1 HR22. It is absolutely a lottery as to which model they bring out. Alot of times the installer will try to pawn off an older box onto a newbie ... so watch out. I would guess that you will receive an HR21. The HR20s are very difficult to find now. D* now has the AM21 to support OTA, which the HR21 and HR22 do not have ... only the HR20 has the OTA.
The HR20 does have the most responsive remote control, but it is silver in color, where the HR21 and HR22 are glossy black (better looking).
The HR22 has a 500GB hard drive, while the HR21 has a 320GB. Recording times are the only "major" difference between the models.
You won't get very far demanding a particular model ... however, demanding that you get a brand new unit will typically be honored.
Good luck and welcome to the adventure!
The HR20 does have the most responsive remote control, but it is silver in color, where the HR21 and HR22 are glossy black (better looking).
The HR22 has a 500GB hard drive, while the HR21 has a 320GB. Recording times are the only "major" difference between the models.
You won't get very far demanding a particular model ... however, demanding that you get a brand new unit will typically be honored.
Good luck and welcome to the adventure!