Picking the right wing/size for starting freestyle

Hello folks,
I have a question regarding the wings to starting freestyle.
I am actually flying under an epsilon 8 27 and I'd like to start some manoeuvers (I have 2 SIV planned before end of october) and a lot of people have told me to get a HOOK 3 as a starting point.

My question is: what size should I buy, my weight naked is 95kg and I fly with an Acro 3 and 2 reserve (~4.5kg)
Should I buy a 21m2 (a lot of people told me to) or get something bigger like 23 or even 25 ?

Thank you