It's a little fast for general music/movie storage. But I'd buy that if I were you. It's not like you're asking about 15,000RPM SAS drives.
But I'm the type of person that can't stand 5400RPM drives. Yea they have a "green" message behind them, but I'm not that patient.
I wouldn't say it's overkill. And it's only a couple $ different from other vendors' 32MB option. Sounds like a good price for a good drive.