Cauliflowers sizes

I'd like to grow cauliflowers next year and have little space and wonder if there are different size plants.
I was told All Year Round was a dwarf variety but on packets they seem quite large so my question is are there mini caulis or are they all quite similar in size?
If they're big I'll give them a miss.
Thanks
Rob

 

There is one called "igloo" looks to be small and specially bred to grow close together.

 

@mazambo
I didn't come across that one and it looks to be right so I'll get some seeds.
Thank you.