I've given a number of vibes as gifts, and I tend to give people Picobong and Wonderland toys. They are good quality, but still affordable to give as a gift. Most of my friends are sex toy newbies, so Wonderland is a good conversation starter with all the other party gals, because it looks so cute and fun. But Picobong is really pretty and non-threatening. I tend to do the fun stuff (like Wonderland, glass, edible bodycare, or couples toys) for parties, since the goal is for everyone to laugh and talk and have a good time. Then I get things like picobong, kegel balls, and massage candles for more "one on one" type gifts, like birthdays.
Honestly, kegel balls would make a great party gift. Half the people there won't know what they are, and will be fascinated with how they work and what they can do; the other half will be talking about 50 Shades of Grey or their own kegel balls, including the benefits they've noticed. So, fun!
I guess my advice is to consider not only the bride, but your company. If everyone is really prudish, go on the tame side. If they look like they would have fun with it, find something cool and interesting to talk about. There are plenty of good quality options in every genre, but I think you'll have way more fun shopping if you think about what kind of fun reaction you want the gift to get!