I have both a 50D and a 5D, and I can't imagine not having either one. I use the 50D for about 70% of my images. But then again, I shoot wildlife, where the crop effect actually helps me get more pixels on the subject.
I checked out your FlickR, and I would say that for what you shoot, the 5D would probably suit your needs better than the 50D.
After shooting tens of thousands of images with each of these bodies, I have the following observations to share:
With the 5D, you can shoot at 800 ISO in almost any situation. In my opinion, the amount of noise in out-of-focus areas of images taken with the 50D is not acceptable, so I feel that I can only shoot the 50D at 400 ISO. You will, in essence, gain a whole stop if you switch to the 5D.
The LCD screen on the 5D is horrible, whereas the 50D's LCD is wonderful. I like to take many images of a subject, and to constantly look at the images I'm shooting on the LCD, so that I can know what adjustments to make. I honestly cannot do this with the 5D, as the LCD is so poor that I cannot even tell whether an image is razor sharp, or just a hair off. Neither can I see how much contrast I am getting by looking at an image on the 5D's LCD. This costs me image quality, as I cannot always know if I need to make a small adjustment or not. With the 50D, I have no problem using the LCD review to determine what needs to be adjusted for the next shots.
"Your" and "you're" are different words with completely different meanings - please use the correct one.
"They're", "their", and "there" are different words with completely different meanings - please use the correct one.
"Fare" and "fair" are different words with completely different meanings - please use the correct one. The proper expression is "moot point", NOT "mute point".