Crysis on any laptop bar the very latest and greatest >$4K machines ain't happening, at least, not well. Either way, if you want that you'll need to move to Windows anyway.
So that said, obviously there's the oft-discussed (and oft-wrong) Mac/Win issues, but I thought I'd drop in my thoughts about the video editing. This may be one roadblock which may not be a big deal.
I'd consider Sony's Vegas if you're looking to move wholesale to Windows for the superior versatility of the platform for entertainment. Unless you're looking to be a pro in the field, where FCE/P skills might be more generally transferable/popular, you might find Sony's Vegas equally competent as FCE.
I have FCP and FCE (which I've ordered preloaded with all of my recent MBP's), and I use Vegas almost always. I have no pro need for video editing, as all I do is to edit myself - filmed on an HDR-FX1 - talking about various concepts I'm trying to explain or to edit the project videos, then either send them off as video files or DVD's. I just wanted the easiest for me to use - so I bought FCP, Vegas and Premiere and a couple of others I can't remember and tried using them all for a while.
I found Vegas easier to get into in a straight shoot-out between FCP running on virtually identical Pro / Dell Precision hardware. I'd hesitate to say however that either is the better than the other for all-round use. The Sony solution simply works better for me, and who knows, it might work better for you. If you have access to (decent) Windows hardware now, give the Vegas trial a go.