I think I would prefer an Anglo. From what I have read it is better suited to more folksy style music, which is what I want. I have already learned a few instruments, mostly piano and saxophone, and I'm okay with a bit of a challenge.
I have looked on eBay, but I'm afraid I'll get something practically unusable. But my budget is tight, so I can't afford a new Rochelle for a while, and I'd rather start on something cheaper just to get started.
Thanks for the advice though! I'm going to keep looking. It looks like getting one on eBay then trying to repair it myself is unlikely to go well. Are concertinas fairly difficult to repair?