Spectacle - http://www.macupdate.com/app/mac/41147/spectacle

Very basic and easy to get used to, fixed options for screen estate.

+1 for Spectacle, I only use like 3 simple configurations, and Spectacle is simple and free.

I've tried a couple of these but I always find I have too many special case layouts for them to be useful. What I really want is something with a grid like divvy where I can then adjust the size and position of a window on the grid using keys. The commands would be something like: add 1 to the top of the window(1 grid unit), move window to the left side of the screen(without resizing), move window up one grid line etc.

Thanks! I was hoping there weren't any good ones - it would have made my next hardware purchase decision easier. It might sound a bit ridiculous, but I really enjoy the workflow, automatic layout of windows and keyboard centricity offered by AwesomeWM.

Am I the only one that doesnt really mater overlapping windows ??

I have tried some of those though, and i like like Divvy even though i rarely use it.