I was taken with the new 27" imac and decided to go with the quad-core. I have been firmly anti-imac until now. The display sharpness is the best I've seen and easy to read if I zoom the safari text one notch. The new mouse took no getting used to and fits the hand perfectly. I thought the keyboard and mouse were wired until I realized it was a security cable. An Apple salesman quickly pointed that out. For burning Blu-Ray video discs with Toast, has anyone had luck with a USB2 external burner, such as the Buffalo BRHC-6316U2? Is USB 2 fast enough?