Since I'm not in the business of designing something new - I'll just list my wife's favs:
Njoy PureWand (we call it the gusher because of the typical outcome)
Fun Factory Tiger (great silicone dildo with just the right curve & ripples)
Decadent Indulgence & Ultimate DI (the best dual stimulators we have)
PipeDream's Basix 7.5" dildo with suction cup - the 2" head puts great pressure on her g-spot but the tapered shaft keep her from feeling she's being over-stretched
We also have some curved glass wands (with handles) that she loves - especially in the summer when the cool glass feels great on her hot skin.