I started with 50/1.8, a fantastic lens at the price. Then about 2 years later, I upgraded to 50/1.4. The 50/1.4 is a better lens in term of IQ and constructions, but it is still prone to front element damage if you are not careful. That is why I have my lens hood on all the time to protect it from banging into things.
For some reason, the 50/1.4 could never satisfy me. After much trials and error, I finally figured out that 50 on cropped body (since you are getting a 60D) is just too tight. I mainly shoot landscape and street photography, and some portraits. That is when I moved to 35/1.4L. The 35 is just perfect. It is being sharpest at 1.4, and the colors and contrasts are just great. The min focusing distance also make it a very ideal lens for food photography if that is what you are into. The superior built also make it worth its price.
If I were you, I would rent the 50mm and see if that is the focal length you need. It is just too narrow for my taste. If you find that 50 is too narrow, then you might actually need a 35. It took me a while to figure out.