OK, so im a bit biased but i'd have to say Blackburn Rovers vs. Burnley. Believe it or not Rovers and Burnley are two of the most sucessful English clubs and are both founder members of the football league, this derby goes back a long way.
English football is full of such rivalies, WBA - Wolves, Bristol Rovers - Bristol City, Preston - Blackpool etc, etc.
Ive also heard a few of the Dutch derby can be interesting, Groningen - Twente perhaps.
If its bloodshed you're looking for you cant beat South America try Independiente - Racing club or some other Argentinian derby.
English football is full of such rivalies, WBA - Wolves, Bristol Rovers - Bristol City, Preston - Blackpool etc, etc.
Ive also heard a few of the Dutch derby can be interesting, Groningen - Twente perhaps.
If its bloodshed you're looking for you cant beat South America try Independiente - Racing club or some other Argentinian derby.