Nope, the raptor is no more good for his cost, I have read somewhere he get owned by a 2TB hard drive, but I don't remember which one it is tho ...
I think it was the Caviar black 2TO from WD. And if it isn't enough for you just get a second Caviar black and make a raid0

. With 150gb you will do nothing. For best quality you need to record without any compression ( fullsize ) I remember when i was recording movies on my 19"@1280*1024, I had like 4gb per 1~2m. So imagine on a 24" :laugh:. My HDD was less powerfull than a Caviar Black so you won't have any issue with it IMO :).