I use Corel Video Studio Pro 8. Have used Corel products for years. It handles the GP files direct from the SD card without decoding first and has some nice features. Corel Video Studio
Wow-- you mean Corel is still around??

Just kidding as I've been a CorelDraw user since version 1. Still use the later versions today. Been tempted to go over to the dark side and get more into Illustrator, but for the most part Draw does what I need just fine.
I had not seen their video software. For the price it might be a good option to consider (although I'm a Premiere Pro user myself).