Paint.NET is better than GIMP, but that's just my opinion.
If you're not going to remove the spindash, at least slow it down.
Missles are awesomes
IMO, PDN = light, quick editing
GIMP = heavy effects, etc.
I use PDN for general purpose stuff or for quick edits.
Since I rarely do big effects and artwork and other stuff, I tend to use PDN more.