CF2's were the thicker spec, in the early days you could get miniature hard drives to get the higher capacity (we used to use them in mini pc's) but they soon became superseded by memory cards as they doubled in size.
All the ones these days are CF1 size
A good Sandisk extreme pro 32Gb will set you back around £45. Your camera might not use the 160M/sec but when you've 600+ images on the card, it makes a difference importing them if you use a USB3 card reader.