I'm the opposite -- bullets and eggs have never gotten me off. The most powerful one I own is Vitality, but I'm STILL waiting on Ina 2 that I ordered 9 days ago, and hope it's at least as strong as Vitality!

I think the RO-120 MM bullet (I think that's the name, not sure) is the strongest one I've owned, bullet-wise. However, if it's just the small size that works for you, then I might would suggest looking into Noa to see if it would match up with your preferences. It's not a bullet or egg, but small and insertable. It's designed for use during penetration, but I use it for foreplay and just insert the small end and let the clitoral end rest on my clitoris. Works great for me, but dies easily and could be a bit stronger.

Yes, the rechargeable ones are always, always stronger and more quality vibrations, for my likings anyway.