I have no problem with sticking with what you know and the investment in it.
Final cut until 2 years ago really had only a one user workflow, they are making some real inroads into the multi user and shared drives workflow but Avid did the teeth cutting on that and remains the king there.
We opted out of helper cards and just purchased raw power. We have these Dell T7500 dual quads with a gazillion gigs of ram (32 I seem to remember) and they huff and puff through everything very well. Do a lot of multi scene animation editing in Premiere with sequential tiffs from Lightwave. Having 2 or 3 terabytes of tiffs brings them close to their knees but they keep running and rendering out. Premiere does get very winded holding that many files in its registers. Nothing compressed, all 1280X720P. Hard drives are like chewing gum, chew em up and spit them out after they lost their flavor, first time I ever worked with a scheduled hard drive replacement schedule. 10 months and they replace them, unheard of but we keep the raids healthy, staggered banks, man they get hot.
2011 wlll bring us quad quads I hope, or something better if it is out. Down right processing power is what seems to make Premiere and Avid stand up and perform. Never had the chance to beef up a FCP apple but it stands to reason it will help it a lot.