Partitioning hard drive ?

I will switch my PC from Windows to hackintosh today.

I have a 256GB SSD that I will use for the OS X system. I am thinking about partitioning that drive : *40-50GB for OS X only (system and library) * 200GB for my datas (home folder) and app.

So, when I'll need to reinstall the system there's no problem with formating the OS X drive. I'll still have my datas and app.