Sounds like you need space then... I'd say for for the 2, 750's like what was posted before, or go for the 1TB(s)... but either way I wouldn't use the Seagate ones until they fix the firmware, and the ones in stores are gone.
I believe they did fix the firmware problem a while ago. I've had a 1.5tb seagate for about 3 weeks and have had no problems at all. Unless theres other problems now...
As far as space goes, are you just saving movies to the drives or are you video editing? Its very very easy to max out 2tb of drive space if your big into video editing.