I have a 1.8ghz imac G5 with a 160 gb HD. I have approx. 139gb free and was wondering if m-powered protools would run well on my system. I have 2gb of ram on the way and was thinking about either upgrading the interenal hard drive, getting an external drive or both. I'm leaning toward the profire 2626. Basically, I'm not sure if I should use an external HD or my internal HD to run protools. Any advice would be appreciated. Thanks!