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!"
appleTV with boxee/xbmc
That is close as you can get at this point. Not really a HTPC but you sure can do a lot with XBMC.
If you don't need HD (or boxee) just buy a old xbox ($50) and put XBMC on it. I used that for years and it hasn't done me wrong until I bought my HDTV.