There are some that transmit to a base unit so you don't have to go to the camera to swap cards. But I have never run one so I know little about them.
Personally I am a fan of the Covert cameras, they have good trigger, outstanding battery life and take a quality pic. The Red40 is my "go to" camera, really good flash range and picture quality. While it's not a black flash the flash duration is very short and I haven't had any camera avoidance issues on the Red40 cameras. Another plus for them is the customer service is fantastic, if you have an issue with a camera they will help you out.