I have to say that I am surprised...no...shocked at how well our new iMac is handling Final Cut Studio. When we bought it, the iMac was sort of a band-aid to get us through some projects we needed to finish up. However, I am no longer in a hurry to upgrade.
For starters, it's way faster than my 3-year-old G5. The new Intel chips really make it whiz and whir. In addition to the 24" built in screen, it has an DVI output to which I've attached the G5's 20" monitor. When using Final Cut Pro, it serves as a high-definition preview monitor...or a tool bank. With other applications, it's more real estate for whatever.
Listen, PCs are okay. But, Macs are great! If you are in the market for a new computer, get over the fear of learning something new and splurge for an iMac or MacBook. I'll help you set it up.
:)