250Gb SSD and 2TB 7200RPM HHD should be fine, if you have some extra money in the end maybe get a bigger SSD, because in my experince it tends to get full very quick, because if you are planning to throw heavy games that take long times to load on HHD, chances are they also take a ton of space, unless you don't plant to put Windows and programs on it, in that case 240Gb should be enough. Also know that a noticeable chunk of memory will be already taken by...SSD stuff. For example, my 240GB ssd has an actual capacity of 218Gb, so keep that in mind too.