Hi im new here so go easy on me if i have made a mistake

I havent bought my Ace yet. I will tomorrow. What i need to know is the memory card capacity that you guys recommend for me. Is the free 2 GB card enough or would i need to purchase a higher capacity.

Just a bit about myself so that you decide. I love to test apps. This is my first android phone so i will probably download a lot of em. And i also dont delete em easily. Also i usually load my music into the phone which would probably exceed 2 GB. So which size would you recommend? 4GB? 8GB? or 16???