Let the hive mind of Engadget get that for you.
"I'm looking for a solid state drive, around 32 to 64GB, for use in my web server. The drive will contain my web sites and the operating system, either Windows Server 2008 R2 or Ubuntu. Large storage is handled by a separate RAID array, so capacity is not an issue. Rather, I am looking for the fastest, longest-lasting, and most reliable drive under $150 that is suitable to my application. Any thoughts? Thanks!"
The lack of an OTA input on the HR21 is what is keeping me from getting this. DirectTV still does not carry my PBS stations in HD(I get 3 different ones that carry a total of up to 10 digital/HD stations OTA), so if I pay for the HR21 DVR I will lose the ability to see my PBS stations in high def. due to lack of the OTA input.
I tried to get DirectTV to give me an HR20, but it became a big hassel for them to find one (installers showed up at my house twice with the HR21 sans OTA). After hours of frustration, I decided to forget the DVR upgrade and stay with what I had (standard HD receiver with OTA input). Maybe if enough folks call Direct TV and ask for OTA capability, the next model (HR22?)will have the OTA input.