Gonna go with 60fps, controlls are alot more responsive and it looks great. For me to get a steady framerate and some effects I hade to go down in resolution.
So now Im going with
Native res 1600*900 (Not so much difference on my tv, sitting 4meters away from a 60")
DOF: 810
DOFblur: 1
SSAO: 2
SMAA: Low
Downloaded this file to get GFWL working and with the Sound.dll I dont have had any crashes in one hour.
Steam profile elpibepiola; So i managed to get it working downloading an older version of dsound.dll from the asi disabler of gta IV. I have had no crash in 2 hours of gameplay, 60 fps with very minor drops. I put the files i used on link below. Just put them in the folder. Reason it was crashing before it was because the dsound.dll was not there, but with the asi, dsound.dll and d3d9.dll and version 1.4 working perfectly.
Link to thread
Link to file