In need of a bit of direction

Fello Nikon Users,
I am really starting to get into the photography, and i want to move into action photography. I have the d70s with the 18-70mm and the 70-300g and I don't have such a high sucess rate with the 70-300mm handheld and when i do get it right, it just seems to be lacking sharpness.
I'd definately like a lens with VR so i can shoot handheld at longer focal lengths. I was wondering how the 18-70 compares to the 18-200 VR in the 18-70 range, and if it was worth the change just for the 70-200mm with VR with no increase in max apature.
I have been reading up and maybe it is worth just forking out once and getting the 70-200m VR and going for a teleconverter. As I assume that it would really be a heap better than the 18-200 in i that range, especially with f/2.8.
I was just wondering how say the 2x teleconverter would change the optical quality and how it would compare to the 80-400VR. I realise i wouldn't be able to use it well for stop action photography, but im sure it has its uses.
Sorry for the long post, theres just so many choices out there, and i really do want to make the right one.
Thank you everyone,
Matt
I am really starting to get into the photography, and i want to move into action photography. I have the d70s with the 18-70mm and the 70-300g and I don't have such a high sucess rate with the 70-300mm handheld and when i do get it right, it just seems to be lacking sharpness.
I'd definately like a lens with VR so i can shoot handheld at longer focal lengths. I was wondering how the 18-70 compares to the 18-200 VR in the 18-70 range, and if it was worth the change just for the 70-200mm with VR with no increase in max apature.
I have been reading up and maybe it is worth just forking out once and getting the 70-200m VR and going for a teleconverter. As I assume that it would really be a heap better than the 18-200 in i that range, especially with f/2.8.
I was just wondering how say the 2x teleconverter would change the optical quality and how it would compare to the 80-400VR. I realise i wouldn't be able to use it well for stop action photography, but im sure it has its uses.
Sorry for the long post, theres just so many choices out there, and i really do want to make the right one.
Thank you everyone,
Matt