If your on a budget, you might want to go for the 200mm F/2.8 L. It is light and autofocuses very quickly, I just got mine yesterday and already have fallen in love with it. It is light weight so good for traveling and very very sharp.
Here are some shots I got with mine, they are cropped in slightly and some of them were shot through window glass so it is very impressive how sharp they are.
Like this second image ... very nice, beautiful colors. That looks like one tack sharp lens Congratulations on your purchase ... since 2009 I've considered getting the 200 f/2.8 L on several occasions but somehow never made up my mind and for better or worse I finally ended up buying the 70-200 f/2.8 L IS II in 2010, but I still look at the 200 L prime with envy.
Thank you very much. I tried to match the colors as much as possible as they were in real life because I was shooting through a tinted glass window that really skewed the colors. I'm a little envious towards your 70-200, I've tried the 70-200 and the only thing it seems to be worse at is distortion and vignetting.