I was lucky in that my own wife was due for one of those 'milestone' birthdays. She has the license already -- she has been riding a Vespa GTS-250 for about nine months now. I realized quickly that I had an opportunity to help her reach the next level. Diamonds might be forever, but picking out your own bike has got to be 100x more exciting than a trip to the jewelry store.
After a rather lengthy debate, she chose the Yamaha FZ6R. An 80HP, 600cc, relaxed sport bike (bars are upright, seat is lower). It had been very difficult to find a bike that she could fit well; she is after all only 5'2" tall. Most bikes with their 32"+ seat height and 500+ lbs can be rather intimidating. The FZ6R seems to be a perfect fit. The only other serious contender was a BMW F800ST -- and that was $4K more for not that much more bike.
So she gained a motorcycle, and I gained a riding partner. How's that for accessorizing?