Welcome to the forum!

I've used Toyboy Imports and found them very good. They don't have a great in-stock range though.
Stay right away from Premium Collectables- you won't get anything but heartache there.
I've also used the little toy company a few times. Their communication is terrible, but I got my pre orders after a months wait.
Oh my Primus in Singapore and tfi direct in Canada are others I've tried with no issues.
There's also savier toys in Vic, which is run by a forum member. It's had some good feedback here.

Have fun with your search!