For just general Slimline pens, I use the Titanium kits from Woodturningz. They are inexpensive, yet Titanium, and gold colored, which a lot of people seem to think is cool. I like the shape of their clip, and it should be a good shape for a woman's pen. Just a reasonable-priced good kit.
As for which kit I think is the best, I always come back to the Streamlined Slimline in chrome from Berea. What a nice kit!
Good Luck!
Scott.