I just need to understand something before my purchase... Lets say I have Logic running on my 5400 RPM hard drive, with an external HD connected through PCI to a RAID 7200 HD. Will the 5400 RPM hard drive bog down recording at all since the software is on that drive??? If it will bog down recording, or other pro apps, then I will just purchase an iMac. If not, I will buy a MBP (I don't want to pay for the upgraded HD). Thanks for the help.