Quote Originally Posted by greycoral View Post
Changing the seat position (up/down) wouldn't affect my neck, would it?
Sure it would. If you move your seat up, you have to crane your neck up while you're riding. Keeping your handlebars slightly above the seat could help.

I'd change just one thing at a time. Try out your new handlebars first. Give them several rides & be sure that your neck & shoulders are rested between rides.