I would start with the Mike Quarry fight (blue trunks in my video) it gives you can accurate representation of his style and since it's a middle roundsish KO you get quite a lot of time to view him before he eventually kills the guy. It's all well and good viewing fights like the Rondan, DePaula etc but, they are just beatdowns. I also recommend the Finnegan fight, got 1974 Ring Magazine fight of the year.
Addie; Finnegan and Tiger for me. The Finnegan fight goes into the late rounds and you get to see a lot of both men. Tiger, who ranks highly on my alltime P4P list (well, below 50 but well inside the top 80), had never been stopped and never would again, one of the scariest K.Os of all time. Foster was a great 175lber (despite not being in a great era for the weight), but I still find him very nervous under pressure. Greg Paterson put it well, like a cat being flicked by water. Nice video BTW, but I turned the sound down ;-)