I have spend few dollars this season on equipment.
I did buy canon 130 mm f 2.0 also 10-22 canon super wide angle and some lights and other stuff. All of them were a good investments but not as good as my new 24 inch monitor. Working on images in 50% scale is incredible. Hands down best investment so far. Right now if I could do everything all over again I would go with monitor first. Personally I am all about lenses, actually I have list of lenses I wont to have. But !!!!
Good big monitor is the best improvement to quality of your work with $800.
Before you spend $ 1000 on new lens get the monitor. Trust me.