With the HR21 you can get the AM21, which is an add-on accessory that connects via USB to the HR21... With the AM21 you get two ATSC (not NTSC) tuners that integrate seamlessly with the HR21's guide and DVR features...
Yes, you can try to get an HR20, but from what I've read there seems to be a consensus that the ATSC tuners in the AM21 are a bit better than the ones found in the HR20.
After you have an HR21 on your account, you can order the AM21 direct from directv.com for $50.
As to HR20 vs. HR21, it seems the color (silver or black) is the biggest difference. For every "The HR20 is better" thread, there is a "The HR21 is better thread" - And that's before we talk -100, -200 or -700!
Yes, you can try to get an HR20, but from what I've read there seems to be a consensus that the ATSC tuners in the AM21 are a bit better than the ones found in the HR20.
After you have an HR21 on your account, you can order the AM21 direct from directv.com for $50.
As to HR20 vs. HR21, it seems the color (silver or black) is the biggest difference. For every "The HR20 is better" thread, there is a "The HR21 is better thread" - And that's before we talk -100, -200 or -700!