Need help with driver

[The Big Schwag]

hey everyone I need some help here

 

first off I am a lefty and having problems off the tee I have a small slice (due to me not turning my wrists at impact so I block it alot with a open club face) that gets me into trouble on occasion...I find the harder I go at it the more I slice and the slower my swing speed the more distance I lose. I am currently using a 580XD OEM R shaft

 

so here is my problem I have demoed the MacTec NVG driver and I can hammer the crap out of the ball with it and tend to play a slight draw with it, swing speed is 97 to 100 mph ball speed around 140 mph spin around 3000 RPM I really like this driver however the R7 460 for lefties comes out in about a month so my question is for the guys or gals with experiance should I hold off on the Mactec and wait to hit the 460, or go ahead and pick up the mactec?

 

thanks in advance