Ninja 250 for the first six months
My wife loves her Ninja 250 and I like it a LOT. It's cheap ($4000 brand new, $1500-2000 used), light (300 pounds), and quick as a cat. It winds up fast and tops out at 110 MPH. Not that a new rider should go that fast, but it can get ya out of trouble where most 250's can't.
Nobody learns to fly on a jet fighter. Have him ride (and drop!) a Ninja for a few months, make the noobish mistakes on a light, inexpensive fun machine. Once he can handle a cycle well, he'll be better suited to pick his keeper ride. The Ninja 250s rep as a starter means there are always plenty for sale, and it will be easy to sell when it's time to move up.
I started on a VN750 and I have to admit, I wish I'd learned on an EX250. I love my Vulcan, but that extra 200 pounds makes it twitchy for a noob.
Laissez les bon temps rouler!
Coastered, R&R relocation, MCCT's, Koso mirrors, Memphis Shades windshield, Mutazu GA hard bags, big monkey in the saddle. ATGATT: Olympia AST hi-viz jacket, Recon 2 (convertible) pants