You can pay more for a UV filter than the cost of the nifty fifty! It is hard to believe how little they cost.

I gotta get a shoulder strap too. My stock Canon neck strap makes the camera smash my sternum already, and with the new heavier lens, it seems like it will be worse. I am waffling on the brand, though. BosStrap, Lens Loop or the Black Rapid. Lens Loop may be in the lead right now. If not, maybe suck it up and go Black Rapid. Or even a guitar strap (for the length) rigged with the screw from Lens Loop or Black Rapid.