I agree with the lessons suggestion. I also think that, from your gear list, the amp is what sticks out as the obvious upgrade area. However, all that being said, I have found that what normally pushes my playing along is playing itself and whatever it takes to inspire me to play more, be that lessons, gear, a new band/dep, whatever. Think about what will make you want to devote more time to playing (constructively) and spend your wonga accordingly.