High Sustained HD Transfer Rates on a Budget?

aibrahim asks: " I need to be able to sustain at least a 23MB/s (That is MEGABYTES per second) transfer rate over the course of about 2 hours. I'd like to get 60MB/s sustained. I also have to be able to perform seeks quickly because I am going to need random access. Can ATA RAID arrays really do it? What would be the difference between using ATA/66 and ATA/100 arrays? What other budget conscious ways are there to get it done ? How about sharing this fast storage across a network? For some context, the application is non-linear editing of uncompressed standard definition television, multiple streams if possible."