My three favorite reuben concoctions would be great with either thousand island or russian dressing, with or without horseradish.
New Years Eve Reuben appetizer: Dice corned beef, rinsed chopped saurkraut, dressing, diced swiss cheese, baked in a casserole, served with rye bread or chips.
Grilled/baked reubens: Assemble with corned beef on dark rye buttered on the outside, dressing and kraut, topped in cheese and then with more dark rye buttered. Bake until crispy on both sides. (wrap in foil and freeze to warm up at another time if you like)
From the German Restaurant up the road: Open faced Red Reubens, dark rye on the bottom, corned beef, dressing and then sweet sour red cabbage, topped in swiss, broiled.
Light on the dressing in all three cases, with extra served on the side.
I make most of these with homemade saurkraut, it's milder than store bought, delicious.