I had tried the one west of white run not truly a fan of it as a battle zone for briasts. want the realistic hand to hand engagement.

I am leaning towards Colossus, havent tried it yet but seems to be quite legit.

is that island arena mod worthy of investment, or will it clash with colossus, i am tending to think its contact zone will clash with colossus and thus choose colossus.

hear underground gladiator is too simplistic, kind of want it just as an immersion feature to the atmosphere.

in terms of legitimate contest as oblivion offered, any firm line designations?

mother [censored] beasts i do not want mother [censored] beast battles primary

I haven't played it, but a simple search for "arena" on the nexus provided http://skyrim.nexusmods.com/mods/9380//? as the most endorsed arena mod. The same search will provide more options.