I have a canon 300mm IS L-USM and i sometime use with it a 1.4 extender on it and the results are superb wether with out the 1.4 or with it,no differance at all ! superb and even for macro shots which i have used for some frog shots,the 70-200 mm you mentioned would be great for sport shots or animal shots at the Zoo !i was thinking of getting one once but at the moment i am happy with what i have mentioned,and i did think of getting the canon 200nn which i could use my extender on,i must admit i am a prime fan !i have a canon 100 to 300 mm f5.6 zoom and hardly us it,you have to say to yourself how much use would i get out of the 70-200 zoom lens then make your mind up !
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