Hi there, I only have stock for Finnex Titanium 600 which sell at RM180.00 or USD56.60 @3.180.
If shipment to Vietnam by normal international parcel = RM50.00 or USD15.70 @3.180.
For Titanium 600, it is slightly head heavy, fast swinging and suitable for attacking style of players.
It perform well for clear, push and also smashes especially in front and middle court.

But for Wave Power Ex, it will be even balance, even faster swinging and suitable for control type of players.
It perform well for players need lighter racket and swing faster. Make fast control move in the court like net play, drop or even attacking at net area.

Just my advice, if you really love how Wave Power Ex perform, you might not like Titanium 600 as I am big fans of Wave Power Ex user here.
You might consider upgrade to Finnex Infinity Team or maybe Infinity Gold if you have the sufficient budget that will give better performance than Wave Power Ex.