My recommendation if you don't want to spend much money is the Deep Water G. Its fantastic. My personal favorite is still the clear ribbed G-spot wonder. Any of the wonders would be good, but with them you take the risk that the head will be smaller or differently shaped than what you expect or than is ideal. There's a bit of variability with Phallix toys.
The Bend Graduate is good. Its only problem is that the head is so small that its easy for it to slip to one side or the other. So you have to control it more than with bigger toys.