Is the bump in speed from 2.93 to 3.06 Ghz worth the money? I will be using the iMac for audio processing- mainly Pro Tools with virtual instruments, plug-ins in surround sound. I will be buying 8 gigs of RAM separately and installing them after I get the computer. Also, about the video card. In light of this being a computer used for audio, should I bump up the video card or is the baseline NVIDIA GeForce GT 120 256MB good enough? I know nothing about video cards. Thanks in advance.