Bigger strings will sort you, and bit of playing time so they lose the new string zing. Bridge should be fine, thicker strings aren't that much thicker. Only thing is you need to file out the nut a little wider so they fit, then draw in the slot with a soft pencil. Make sure you make the slot wider not deeper. As for buzz, thats an allen key job, can do it on your own much cheaper than a tech, pm me and I can talk you through on msn or something if you like.
Oh, mickel strings probably what you want, if you don't play regular, steels will eat your fingers. Nickels are warmer generally too.