This might be a little more than you want to spend, but the pen that comes to my mind immediately is a Pilot Decimo in the pink (aka champagne) color. It's a shimmery but subdued pink, and I think it's a very cute pen (and I love the ease of the retractable nib). See Taki's photo here (scroll down for it):
http://www.fountainpennetwork.com/forum/in...ecimo&st=15If you do an internet search of "pink decimo," you'll probably come up with a lot more photos and places to order it. It is not typically sold in the US, so I ordered mine from Japan (easy transaction).
Nibs on Japanese pens tend to run smaller than Waterman's, I think. I used to have the Hemisphere in a medium nib, and the Hemisphere medium wrote wider than the Decimo medium does. Your wife might like the medium in the Decimo, or maybe the fine (I've never tried the fine, personally).
For what it's worth, I didn't especially like the Hemisphere, which was the first fountain pen I bought for myself. I regretted the purchase later because I didn't pay enough attention to the ergonomics of it. It was rather heavy and also top-heavy with the cap posted on the back. Plus, the pen felt a little too slim for me in the grip. Trying to hold a skinny pen tightly to keep the weight of it upright was fatiguing for me. I didn't enjoy it. The size, shape, and weight (I think it's lighter) of the Decimo suits me much better, but everyone's grip is different, so take this with a grain of salt.
As for the Pelikan M605, I don't have that pen, but I have a Pelikan M620 (Athens), and the size and weight work well for me, too. I usually use the fine point in the Pelikan, sometimes medium. I love my Pelikan, too.