EF 300 f/2.8 L USM - out of service, hard to get spare parts
Said to have great image quality and build like a L should be
Must use tripod as it has no IS - sold at around 2,000€ here in Germany. I'd already have one if there wasn't the spare parts issue
Sigma made a 300 f/2.8 as well without OS which is sold for 500 less
Other options are 300 f/4.0 L IS USM and may be the 400 f/5.6 L USM. But it doesn't have IS and a 5.6 aperture :/ Both are around 1000€ used.
I probably end up with the 400 5.6 as I don't need the 2.8 for motorsports and if I do I still have the 70-200
The latest (but discontinued) version of the Sigma 400mm f5.6 (must be the HSM APO version) works on some EOS bodies, and is very cheap, and well reviewed.
I found one at ffordes.com and was able to try it on my 600D and 7D, the particular example wouldn't play nice with the 600D so it was a non-starter, try before you buy, but potentially a good buy.
Potentially a crap buy also of course, so check on both bodies.
