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!"
Geoff you are correct.
For feature length films the ability to record 3hrs of content covers %95 of all movies. Where 51GB discs will come into play is programme like the Extended Editions of LotR and TV Series on disc.
When both formats can deliver excellent programming on 25-30GB discs you realize that the extra stuff is just going to hold "more" stuff but not necessarily better looking stuff.