Hello everyone

I hope you dont mind putting up with my...well newbie questions. I love computers, but know very little about them. I am havign a blast with video editing, but have found that the 80gig on my comp ran out very quickly. My original plan was to add an external drive (since it seems easy enough and i dont think i know enough to add and internal). My questions is: Are the external drives worth it? Are they a great deal slower than an internal? (Keep in mind my main intetions if for video editing). Or am i better off doing an internal drive, in which case i would need a little instruction and tips on which on to get

. Thanks for reading
-Daem