Thanks everyone for the choices!!
I use a Dublin (I think) and I love it, I know Vipers are good but it's personal opinion. Check the standard as well to make sure you can use it in competitions. A lot of people prefer the newer divided bits of foam as it gives you more freedom to move (like the Viper vests) but my Dublin is just 2 big bits of foam. Try some on in a saddlery or horse shop and see what you think