Need flash with high sync speed - suggestions?

[Designer]

So what is a good high-powered flash number? Like, can I get a GN of 100 or is that not possible?

I consider my SB-910 to be an "adequate" speedlight at GN 34(meters) or 111 (feet) at ISO 100. Are you wanting a GN of 100 METERS? If so, you will probably want to go to a "pack and head" studio strobe where the "pack" is a battery pack, so you don't need to plug it in. You can get lots of power in a studio strobe.

 

[ratssass]

Brand	Yongnuo
Model	YN467
First introduction	2009
Successor	none yet
Output Specs
Guide number spec (35mm, ISO 100, in meters)	33
Guide number test result	20
Manual power settings	1/1 – 1/2 – 1/4 – 1/8 – 1/16 – 1/32 – 1/64
Flash duration (full power)	1/800
Recycle time spec (at full power)	5 sec alkaline
Recycle time test result	1.9 sec alkaline, 1.4 sec NiMH 33 meters is about 100'.........but see guide number test result