Re: How much different is 4 from 6 really,

[andy shnikes] "but there is also an elitist attitude on here that gets on my nerves. The whole industry of entertainment has a whiff of it, like somehow because they have this "power" to semi-immortalize people they think they can do say and act any way they want, and the rest of the world has to kiss their feet because of it."

Dude, this is a forum run by pros. If you want to learn how the pros work, this is an awesome place to be. I'm still a student, so I'm here to learn and get smacked around and corrected sometimes because that's how I get better. You asked their opinion. Chill. If you want advice for amateur/consumer level production, try the Apple forums or something.

To finish answering your question, your TiBook probably won't be able to handle anything higher than FCP 5 or FCE 3. You've probably got the best software for your hardware right now. If you want to upgrade, plan on at least $4,000 to upgrade to current consumer/prosumer gear (new consumer HD camera, MacBook Pro, FCS 2).