Help with new iMac, Suitcase Fusion 3 and Fonts

I've worked on Macs as a Graphic Designer for over 20 years. The biggest problems I've ever had over the years have been font issues. I now just bought a new 27" iMac and want to start fresh. I upgraded to Suitcase Fusion 3 and need to bring my large collection of fonts over from my G5. Does anyone have any suggestions as to the best method to do this so I don't end up with a ton of font problems later on? And, is it true Helvetica should be avoided now?

I've only done forums a couple times over the years and not recently so bear with me.