just one thing: Please do not work with kilobyte, in any of the values

My default nexus is about 200 to 500 MB, speeds up level loading a lot
For video memory i take about 250 MB as granted (most today graphics have a lot more)
sys_memory is the normal virtual RAM, so with gamestudio maximum here is ~3.5 GB, as most modern PCs have about 4 GB, you can use this