ninja250.org is an excellent resource and has all the shock compatibility info, tire recommendations and a decent forum too.
I never had a problem with wind gusts...i'm a light tall guy too. But then again I didn't do a ton of highway riding with it. The other problem is at 75 mph in 6th gear it's revving along like a two stroke and even a downshift and you can't get out of your own way sometimes it seems...there are some serious distance riders on the forum there though lol.
Even if he doesn't do the emulators, at the least get a set of (I always say linear but won't start that argument again) springs. Yes i'm also going to recommend Sonic Springs for the springs again like I seem to do in every suspension related post, they send EXCELLENT instructions JUST for the 250 ninja on how to set the preload with a spacer, what fork oil weight to use based on your weight etc....They know the 250 Ninja's VERY well.
This was mine before and after, bought it 3 years ago from my boss at the MSF course, put a new clutch in it, oil change, made her nekkid
, and did all the above mentioned upgrades...rode the tires off of it for a couple years and then sold it to a friend. It was green when I got it and fairly dented up, painted it a black with a slight metallic effect. Like the bags? They worked great!
Before paint and fairing removal:
After with the removal bags off to show off the paint lol