I'm not sure about the phenom 300 either, but we are supposed to demo one in the next few weeks. I do agree with everyone else about the G1000 though. Having to take a jet in and out of nav mode with turning in a course is a little old school... Seriously, this is supposed to be high-tech Garmin stuff. We have synthetic vision with our G1000, but it's not smart enough to allow us to type a hold in through the box.
On the other hand, the G150 is a great airplane, and pretty easy to fly. I love the Collins Pro-Line as well. However, that's moving on up a bit from the Phenom 300 size. I would think a CJ4 or Lear 40/70 would be a lot more comparable in size to the 300. I'll repost some info after we demo the Phenom in a few weeks. Good luck!