I had the Pocket Fairy and while I know its power won't quite match up to the larger ones, it still had some kick... BUT it was so buzzy that it did absolutely nothing for me and I hated it. Many people say how buzzy (AND loud) the entire line is, so if you don't like buzz and very loud, don't go that route.
I have the Mystic Wand Rechargeable and it's not bad... it's got some kick to it, but by no means is it as strong as the Hitachi or Smart Wand large.
I also have the Couture Pink Inspire that others have mentioned. It's not bad. It's got some power, it's corded, and the pink one comes with two other attachments other than the smooth dome one. Honestly though, I don't find it as powerful and deep as the Hitachi. I find it to be more buzzy, especially at its higher speeds.
The large LELO Smart Wand is nice (I had the medium for a little bit and didn't care for it). Its vibrations are nice and deep, it's rechargeable, it's pretty quiet, but the vibrations travel through the handle something fierce and it kind of drives me nuts and makes it hard for me personally to get off with it. On its highest setting it's not as strong as the Hitachi, but it's the strongest rechargeable that I've come across so far. But it's also the most expensive as well.
As for the Hitachi... I stayed away from it for a long time thinking that I wouldn't like it, need it, etc. Until I ran out of things that I wanted to buy and finally decided to get it. Yeah, I definitely wish I had gotten it sooner. I really do like it. If you like power and don't need pinpoint stimulation, get the Hitachi. Yeah it's corded, big, loud, etc... but I was surprised that I found it smaller, lighter and a bit quieter than I had expected. Honestly wish I had bought it instead of a lot of other (dud) toys I bought.
Now for the Mood Fantastic wand... well, I can't say much about that. Yet. I should have that in the mail today, so I'll have to get back to you later about that.