The Pleasure Kiss is an excellent option in terms of g-spot stimulation, as it works on covering gently all possible spots instead of using one single large bump or pinpoint pressure. Although the very tip of the toy can be worked in that way, you will want to use the nubs. The TPR toy has 8 vibration settings, but note that is does not have any constant vibe modes. Still, it's worth trying, and was the toy that first came to my mind when recently asked recommendations as g-spot vibes.