Like most people Ego pens to start with then moved to an iStick 30 shortly after. I also bought an MPV 3.0pro, which I love but it isn't the most friendly to hold. I still use the iStick and MPV in my daily rotation, mostly with iSubtanks. I also have a Vision Spinner 2 knocking about.
I recently picked up an iTaste SVD2 which I bought very cheaply on a whim, but actually I really like the feel of it and use it far more than I thought I would (it goes very nicely with a Nautilus on top).