Don't go so thin you can't shoot the darn thing. Some of the latest crop are the size of a credit card and darn near useless over five yards.
Very true indeed. It is for that reason I selected the Kahr PM9. It is very shootable to say the least. This target is from a failure to stop drill I was running some time ago. If the PM9 is too pricey, then take a look at the CM9. Same size, same performance, but with a few things done to lower the price point.