I like the IPV Mini but if you are looking for something really small it might not be for you. With an RDA it is only maybe a 1/4" smaller than the IPV, and a little more than half its width. That being said I use it with an Orchid clone for work all the time. I just don't find it to be a very pocket friendly device.
I would also say wait for the Istick 30 or 50 watt, mostly because I am really curious about both of those.