I'm at 108 right now with a 22 inch monitor using the HiRes Pac at 1024.
If you have TrackIR, pulling your FOV out farther towards 120 in the manual FOV number set will make your head movement from front quarter to front quarter less of a movement. Also the default head position will have a slightly wider periferal. This will make seeing across your front 180 easier and faster. As you pull your FOV out there will be a sweet point at which things like your tracers from a wirbel will become smaller but, show crisper all the way to your target. Same with tracers in air to air. You will also find from an 88 shooting at tanks long distance they will be a bit crisper on full zoom.
One thing to watch for, I've caused a reduction in my FPS by using numbers higher than 120 for my 22 inch monitor. That could have been a factor of the vid card I was using at that time.