I wanted to buy a new Mac Pro, but it was pointed out that it was way more than I needed to process digital photos. Also, the price is over the top. I am now considering the IMac; one of the 27" models. My question is: Can I not use the wireless keyboard and mouse? Can I use the same keyboard and mouse from my G5? Can I plug them into one of the USB ports. My external HD is a Firewire 400 connection. Will this work in the one FW 800 port on the IMac? My reason for upgrading from my G5 is that Photoshop Elements 8 will not work on my G5. PE 8 has some features I would like to have.