well the 50mm 1.4 lens is an incredible, professional quality lens offering superb sharpness, making little to no compromise in image quality. This lens shines incredibly with low light conditions.
Incredible portraits, and just all around amazing quality is what you can expect from it. If you could only own 3 lenses, this would have to be one of them.
Now the 50mm f/1.8 is going to be almost identical, only the f/1.4 will become faster quicker (f/2); they will both be on par back up at f/4 however.
The 18-55VR is also a high quality lens in a cheap package. Most people dismiss it because it is cheap, comes with the most basic DSLR's, and feels like a cheap toy, but it's IQ results are on par with much more expensive glass.
It would be good to have and use along with the 50mm and would give you a little reach to boot.