I'm interested in getting an external Hard drive for my iMac 7,1. Specifically I'm looking at the OWC Mercury On-The-Go Pro (http://eshop.macsales.com/shop/firewire/on-the-go). I'm planning on using it with Firewire 800, and my question is whether or not The 7200 RPM model would provide any significant performance advantage over the 5400 RPM. Based on the benchmarks on OWC's website, it looks like the Firewire 800 port might be a bottleneck to both drives achieving there maximum Read and Write speeds, as there performance is both approximately identical. http://eshop.macsales.com/item/Other World Computing/MS8U5500GB8/ http://eshop.macsales.com/item/Other World Computing/MS8U7500GB16/ (See the benchmark tab) Thanks for any advice you can give me!