I would get the Lelo Sona!
Your wife would thank you time and time again.
It will likely cause her to orgasm in seconds!
It isn’t really much of a vibration but a pulsation and has slight suction. I would recommend the lowest setting to start with because it can be very intense (in a good way).
I would highly recommend the Lovehoney Desire Bullet, I love mine and it never fails to work for me. It's also rechargeable so no having to buy batteries all the time. 
I second this!