My wife and I love digital video editting on our macs. However on our dual G5 our 160 gb hard drive is full and we are wanting to add another one. I am curious as too what you experts would do (besides erasing our precious movies). Should we get an internal, external, or what about a RAID set up? I am not very knowledgable about a RAID setup, please show pity on my grammar and knowledge! 