It is just a coincidence that I was able to buy these two lenses in the same week . . . I definitely will be waiting a while to buy more.  The lens that arrived today is a Canon 70-200mm f/2.8L.  I have been waiting a long time to get a telephoto zoom lens and this one should not disappoint.

Being able to shoot in low light situations is important to me, which is why I chose to go with the f/2.8 instead of the f/4 which is half the price.  Tonight I went out and took many shots around dusk on a cloudy day and most of them were taken at f/2.8 or f/3.5 with a 1/320 sec. shutter speed.  With a 200mm lens and a 1.6x crop factor, 1/320 is cutting it close.  If I didn't have the f/2.8 I would have had to bump the ISO way up.