If it's just for yourself, get the Epson or the Sony. I've not been happy with the color output of the Selphys. For the Sony, you can get the ones with the smaller LCD screen, many deals on the buy and sell and on HWZ - about 200 each, bnew and unopened.
yah, that's pretty much I can gather as well just from your title alone.
Details on your budget, transport, frequency of use, right down to the operation setup can result in valuable advice. I have the feeling you're not entirely certain about how it goes? So you should get that sorted out before even asking what printer to get.
just some relevant information on how instant printing is an alternative income source but also an added workload. We'll be quite happy to assist you in the planning/setup, I think we only ask that you price your services reasonably and not under $100 like some other freelancers might.